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What it is
Guide to building a sustainable wardrobe including ethical brand evaluation, secondhand shopping strategies (ThredUp, Poshmark, consignment), capsule wardrobe principles for sustainability, fabric guide covering organic, recycled, and problematic materials, clothing care techniques to extend garment life, and basic repair and mending skills.
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SKILL.md
457 lines · 3,182 words
Use this skill when:
User wants to build a more sustainable wardrobe
User needs guidance on ethical fashion choices and brands
User wants to reduce clothing waste through capsule wardrobes or secondhand shopping
Guide to building a sustainable wardrobe including ethical brand evaluation, secondhand shopping strategies (ThredUp, Poshmark, consignment), capsule wardrobe principles for sustainability, fabric guide covering organic, recycled, and problematic materials, clothing care techniques to extend garment life, and basic repair and mending skills.
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What it covers
When to Use
Process
Questions to Ask First
Phase 1: Understanding Fashion's Impact
Phase 2: Ethical Brand Evaluation
Phase 3: Secondhand Shopping
Phase 4: Capsule Wardrobe for Sustainability
Phase 5: Fabric Guide
Phase 6: Clothing Care to Extend Life
Phase 7: Repair and Mending
Phase 8: Building a Sustainable Shopping Mindset
Output Format
Example
Sustainable Fashion on a Budget
Edge Cases
User needs to evaluate the sustainability claims of fashion brands
Do NOT use this skill when:
User wants general style advice unrelated to sustainability -- use fashion/style skills
User needs textile recycling or upcycling crafts -- use crafting skills
User wants fast fashion recommendations -- this skill promotes sustainable alternatives
Step 1: Audit current wardrobe: what is worn regularly, what is neglected, what needs replacing
Step 2: Establish sustainable fashion priorities: longevity, ethics, environmental impact, budget
Step 3: Build a capsule wardrobe framework with versatile core pieces
Step 4: Identify sustainable sourcing options: secondhand, ethical brands, local makers
Step 5: Create a purchasing decision framework: need vs. want, cost-per-wear calculation
What is your current relationship with clothing and shopping?
What is your budget for clothing (monthly or annual)?
What is your primary motivation (environmental, ethical, financial, minimalism)?
Do you already have a sense of your personal style, or are you developing it?
What is your lifestyle (professional, casual, active, varied)?
What climate do you live in?
Are there specific ethical concerns you prioritize (labor conditions, animal welfare, environmental impact)?
Do you have any sewing or mending skills?
Are there secondhand stores, consignment shops, or thrift stores accessible to you?
How much closet space do you have?
The fashion industry produces approximately 10% of global carbon emissions
85% of textiles end up in landfills or incinerated each year
A single pair of jeans requires approximately 1,800 gallons of water to produce
Synthetic fabrics shed microplastics with every wash
Garment workers in many countries earn below living wages
The average consumer buys 60% more clothing than 15 years ago and keeps each item half as long
1. WEAR WHAT YOU HAVE (most sustainable garment is the one already in your closet)
2. BORROW OR SWAP (use without consuming)
3. BUY SECONDHAND (extend the life of existing garments)
4. BUY SUSTAINABLE (new from ethical/sustainable brands)
5. BUY CONVENTIONAL (last resort -- choose quality and timeless design)Checklist for assessing brands:
Transparency: Do they publish their supply chain and factory information?
Materials: Do they use organic, recycled, or sustainably sourced fabrics?
Labor practices: Do they ensure fair wages and safe working conditions?
Environmental practices: Do they minimize water use, chemicals, and carbon emissions?
Certifications: Do they hold third-party certifications (see below)?
Circularity: Do they offer repair, resale, or recycling programs?
Longevity: Are garments designed to last?
| Certification | What It Covers |
|---|---|
| GOTS (Global Organic Textile Standard) | Organic fibers, environmental and social criteria |
| Fair Trade Certified | Fair wages, safe conditions, environmental standards |
| B Corp | Overall social and environmental performance |
| OEKO-TEX Standard 100 | Tested for harmful substances |
| Bluesign | Sustainable textile production |
| GRS (Global Recycled Standard) | Recycled content verification |
| Cradle to Cradle | Material health, circularity, clean air, water stewardship |
| SA8000 | Social accountability in supply chains |
Vague claims without specifics ("eco-friendly," "green," "conscious" with no detail)
No third-party verification or certification
Sustainability marketed as a small collection while 95% of products are conventional
No supply chain transparency
Claims about one aspect (recycled packaging) while ignoring major impacts (production)
Offsetting instead of reducing
| Platform | Best For | Price Range | Quality Control |
|---|---|---|---|
| ThredUp | Basics, everyday brands | $-$$ | Platform inspects and lists |
| Poshmark | Designer and trendy finds | $$-$$$ | Seller-listed, buyer reviews |
| Depop | Vintage, streetwear, trendy | $-$$$ | Seller-listed |
| The RealReal | Luxury and designer | $$$-$$$$ | Authenticated |
| eBay | Everything, wide range | $-$$$$ | Varies widely |
| Facebook Marketplace | Local finds, no shipping | $-$$ | Meet in person, inspect yourself |
| Local consignment shops | Curated quality pieces | $$-$$$ | Shop inspects and curates |
| Goodwill / Salvation Army | Budget-friendly basics | $ | Varies widely, treasure hunting |
| Buffalo Exchange / Plato's Closet | Young adult trendy styles | $-$$ | Store-curated |
| Swap events | Free or trade-based | Free | Varies |
Know your measurements (not just size -- bust, waist, hip, inseam in inches/cm)
Check fabric content before purchasing
Inspect seams, zippers, buttons, and overall construction
Look for stains, pilling, and wear in photos (or in person)
Research retail prices to ensure secondhand prices are actually good deals
Set up saved searches and alerts for specific brands or items
Shop off-season for better deals (winter coats in summer)
Check return policies (some platforms have limited or no returns)
Wash all secondhand clothing before wearing
Best platforms for selling:
Poshmark: Good for branded items, easy listing with photos
ThredUp: Send a bag, they list and sell (lower payout per item)
Facebook Marketplace: Best for local, no-shipping sales
Consignment shops: Drop off and they handle everything
Selling tips:
Clean, steam, or iron items before photographing
Take clear photos in good lighting (flat lay or on hanger)
Include measurements and fabric content
Price fairly (check comparable sold listings)
Ship quickly and package neatly
A curated collection of versatile, high-quality pieces that mix and match to create multiple outfits. Typical size: 25-40 pieces (excluding underwear, sleepwear, and workout clothes).
Step 1: Audit Your Current Wardrobe
Take everything out
Sort into: Love/Wear Often, Sometimes Wear, Never Wear
For "Never Wear" items, ask why (does not fit, does not match anything, uncomfortable, wrong style)
Donate, sell, or swap "Never Wear" items
Identify gaps in "Love/Wear Often" pile
Step 2: Define Your Core Palette Choose 3-4 neutral base colors and 2-3 accent colors that work together:
Example Palette:
Neutrals: Black, white, navy, gray
Accents: Burgundy, olive, camel
Every piece should work with at least 3 others in your wardrobe.Step 3: Build the Foundation
| Category | Essential Pieces | Quantity |
|---|---|---|
| Tops | T-shirts, button-down, blouse, sweater, tank | 8-12 |
| Bottoms | Jeans, trousers, skirt, shorts (seasonal) | 4-6 |
| Outerwear | Jacket, coat, blazer, cardigan | 3-4 |
| Dresses/Jumpsuits | Versatile styles that dress up or down | 2-3 |
| Shoes | Everyday pair, dressy pair, casual pair, boots | 4-5 |
| Accessories | Bag, belt, scarf, jewelry (minimal) | 4-6 |
Step 4: Apply the One-In-One-Out Rule For every new piece that enters your wardrobe, one piece leaves (sell, donate, or swap).
Buy fewer, better quality items
Less decision fatigue (everything works together)
Less waste (fewer impulse purchases, fewer unused items)
More investment in pieces you love and wear regularly
Reduced environmental footprint
| Fabric | Sustainability Rating | Pros | Cons |
|---|---|---|---|
| Organic cotton | Good | No pesticides, biodegradable, breathable | Still water-intensive to grow |
| Linen (flax) | Excellent | Low water use, durable, biodegradable, gets softer | Wrinkles easily |
| Hemp | Excellent | Low water, no pesticides, very durable | Can feel rough initially |
| Tencel/Lyocell | Very Good | Closed-loop process, soft, breathable, biodegradable | Moderate energy use in production |
| Recycled polyester | Good (vs virgin) | Diverts plastic waste, durable | Still sheds microplastics |
| Recycled nylon | Good (vs virgin) | Diverts waste (fishing nets), durable | Still sheds microplastics |
| Organic wool | Good | Renewable, warm, durable, biodegradable | Animal welfare considerations |
| Peace silk | Good | No silkworms killed, natural fiber | Expensive, limited availability |
| Pinatex (pineapple leather) | Promising | Waste-based, vegan | Still relatively new, mixed reviews on durability |
| Deadstock fabric | Excellent | Uses existing material, no new production | Limited availability |
| Fabric | Concerns | Notes |
|---|---|---|
| Conventional cotton | Pesticide-intensive, heavy water use | 16% of global insecticides used on cotton |
| Polyester (virgin) | Petroleum-based, sheds microplastics, slow to biodegrade | 60% of all garments contain polyester |
| Nylon (virgin) | Petroleum-based, energy-intensive, sheds microplastics | Common in activewear and swimwear |
| Rayon/Viscose (conventional) | Deforestation risk, chemical-intensive processing | From wood pulp, but processing is polluting |
| Acrylic | Petroleum-based, worst microplastic shedder | Often used as cheap wool substitute |
| Conventional leather | Tanning chemicals, deforestation (cattle), high water use | Complex -- longevity can offset impact |
| PVC/Vinyl | Toxic production process, non-biodegradable | Avoid when possible |
Use a Guppyfriend washing bag or Cora Ball for synthetic garments
Wash synthetics less frequently
Wash on cold, gentle cycle (less friction = less fiber release)
Air dry when possible (dryer agitation increases shedding)
Choose tightly woven synthetics over fleece or loose knits
| Guideline | Why It Matters |
|---|---|
| Wash less frequently | Extends fabric life, saves water and energy |
| Use cold water | Prevents shrinking, fading, and fiber damage; saves energy |
| Turn garments inside out | Reduces pilling, fading, and surface wear |
| Use gentle/delicate cycle | Less agitation = less fiber damage |
| Use mesh laundry bags | Protects delicates and reduces tangling |
| Use gentle detergent | Harsh chemicals degrade fibers faster |
| Avoid overloading | Garments need room to circulate |
| Zip up zippers, fasten hooks | Prevents snagging other garments |
| Garment | Wash After |
|---|---|
| Underwear and socks | Every wear |
| Activewear | Every wear (or 2 if light use) |
| T-shirts and tank tops | 1-3 wears |
| Dress shirts/blouses | 2-3 wears |
| Jeans | 5-10 wears (spot clean as needed) |
| Sweaters and knits | 3-5 wears |
| Blazers and jackets | 5-6 wears or as needed |
| Outerwear | Seasonally or as needed |
| Bras | 3-4 wears |
| Pajamas | 3-4 wears |
Air dry whenever possible (dryers are the biggest cause of garment wear)
Hang or lay flat to dry (knits should lay flat to prevent stretching)
If using a dryer, use low heat
Remove promptly to reduce wrinkles
Never put delicates or wool in the dryer
Store knits folded (hanging stretches them)
Use padded or wooden hangers for structured garments (blazers, dresses)
Keep clothes in a cool, dry, dark place
Use cedar blocks or lavender sachets instead of mothballs
Store off-season clothing in breathable garment bags (not plastic)
Button and zip garments before storing
Sewing on a Button (Most Common Repair):
Thread a needle with matching thread, knot the end
Position the button and push needle through from the back
Pull through, then push through opposite hole
Repeat 4-6 times through each pair of holes
Wrap thread around base of button several times (creates shank)
Push needle to the back and knot securely
Patching a Hole:
Iron-on patches: Quick and easy for larger holes
Visible mending (sashiko-style): Decorative stitching over the repair, embraces imperfection
Darning: Weaving new threads through holes in knits
Hand-sewing: Small holes can be closed with a simple whip stitch
Fixing a Hem:
Turn garment inside out
Pin the hem at the desired length
Use a blind hem stitch (barely visible from outside)
Or use hemming tape (iron-on, no sewing) for a quick fix
Replacing a Zipper Pull:
Clip on a key ring or paperclip as a temporary fix
Thread a ribbon or cord loop through the slider for easy grip
Full zipper replacement is more complex (consider a tailor)
Garment is valuable or sentimental
Alteration requires structural changes (taking in seams, adjusting shoulders)
Zipper replacement
Leather or heavy material repair
Complex alterations (hemming dress pants with a crease, resizing)
Needles (assorted sizes)
Thread (black, white, navy, and colors matching your wardrobe)
Scissors (small, sharp)
Pins and pincushion
Seam ripper
Iron-on patches
Hemming tape (iron-on)
Button assortment
Thimble
Measuring tape
Do I actually need this, or do I just want it right now?
Do I have something similar already that serves the same purpose?
Can I borrow, rent, or buy this secondhand?
Will I wear this at least 30 times (the "cost per wear" test)?
Does it fit well and feel comfortable right now (not "when I lose weight" or "after alterations")?
Does it work with at least 3 things already in my wardrobe?
Is it made from quality materials that will last?
Do I know who made this and under what conditions?
What happens to this garment at the end of its life?
If I saw this again next week, would I still want it? (If unsure, wait.)
Cost Per Wear = Purchase Price / Number of Times Worn
$100 jacket worn 200 times = $0.50 per wear (great value)
$20 trendy top worn 3 times = $6.67 per wear (poor value)
Before buying, ask: "Will I wear this at least 30 times?"
If yes, it is likely a good purchase.
If no, reconsider.| Condition | Best Option |
|---|---|
| Good condition, just tired of it | Sell, donate, swap, consign |
| Minor damage, still wearable | Repair and continue wearing, or donate |
| Significant damage, not wearable | Textile recycling bin, cut into rags |
| Stained but intact | Cut into cleaning rags, textile recycling |
| Sentimental but unwearable | Repurpose (quilt, pillow, framed) |
Municipal textile recycling bins
Brand take-back programs (H&M, Patagonia, The North Face, Eileen Fisher)
TerraCycle textile recycling
Local textile recycling events
Thrift stores (they sort and recycle what cannot be sold)
Sustainable fashion is not about having a perfect wardrobe. It is about making more thoughtful choices, wearing what you have, and reducing the cycle of constant consumption. Every garment kept in use longer is a garment that did not need to be produced.
SUSTAINABLE FASHION OUTPUT
==========================
Section 1: Assessment / Analysis
- Key findings
- Recommendations
Section 2: Action Plan
- Step-by-step guidance
- Timeline if applicable
Section 3: Resources
- Relevant references
- Next stepsInput: "I want to dress more sustainably but I am on a tight budget. I cannot afford expensive ethical brands. What can I do?"
Output:
Sustainable fashion does not mean expensive fashion. The most sustainable garment is the one you already own.
1. Buy Less, Choose Better (Cost: $0)
Before any purchase, ask: "Will I wear this at least 30 times?"
Cost-per-wear formula: Price / Expected wears = true cost
A $60 jacket worn 200 times ($0.30/wear) beats a $15 jacket worn 5 times ($3.00/wear)
2. Secondhand First (Cost: 50-80% less than retail)
| Source | Best For | Price Range |
|---|---|---|
| ThredUp | Everyday basics | $5-25 |
| Poshmark | Brand names | 40-70% off retail |
| Local thrift stores | Everything | $2-15 |
| Clothing swaps | Free refresh | $0 |
3. Care for What You Have (Cost: minimal)
Wash cold, hang dry (extends garment life 50%)
Learn 3 basic repairs: button replacement, hem fix, seam repair
Store properly: fold knits, hang wovens, use cedar for wool
4. Build a Capsule Wardrobe (Cost: saves money long-term) Core 30 pieces that mix and match into 100+ outfits:
5 tops, 4 bottoms, 3 dresses/jumpsuits, 2 jackets, 3 shoes, 2 bags, accessories
5. When Buying New: Know the Best Budget-Ethical Brands
| Brand | Price Point | Certifications |
|---|---|---|
| Pact | $15-40 | Fair Trade, GOTS organic |
| Uniqlo (select lines) | $15-50 | BlueSign materials |
| H&M Conscious | $10-40 | Recycled materials (verify claims) |
Incomplete information: Ask clarifying questions before proceeding. Do not assume details the user has not provided.
Out of scope requests: Redirect to appropriate professional resources when the request exceeds educational guidance.
Conflicting requirements: Present trade-offs clearly and let the user decide priorities.
SKILL.md
457 lines · 3,182 words
The text of SKILL.md is shown as it downloads, under the Apache-2.0 license, by Ferrox Labs. The license is the one in the file's own frontmatter.
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