Size Guide
When to Use This Skill
Use this skill when you need to:
- Create a size guide for apparel, footwear, or sized products
- Reduce return rates caused by incorrect sizing
- Build size comparison charts across international standards
- Write measurement instructions customers can follow at home
DO NOT use this skill for product specifications, general product descriptions, or manufacturing size specs. This is for customer-facing size guidance.
Core Principle
EVERY SIZE GUIDE MUST ANSWER: "WHAT SIZE SHOULD I ORDER?" IN UNDER 60 SECONDS — IF CUSTOMERS GUESS, THEY RETURN.
Phase 1: Brief
Required Inputs
| Input |
What to Ask |
Default |
| Product type |
"What product needs a size guide? (tops, pants, shoes, accessories, furniture)" |
Must be provided |
| Size range |
"What sizes do you offer? (XS-XXL, numeric, one-size)" |
Must be provided |
| Measurements |
"Do you have garment measurements or body measurements for each size?" |
Must be provided |
| Fit type |
"How does the product fit? (true to size, runs small, runs large, relaxed, slim)" |
True to size |
| Markets |
"Do you sell internationally? (US, UK, EU sizing needed?)" |
US only |
| Return data |
"What percentage of returns are size-related?" |
Unknown |
GATE: Confirm brief and measurement data before proceeding.
Phase 2: Design
Size Guide Components
- Size chart — measurements mapped to each size
- How to measure — step-by-step instructions with body measurement points
- Fit recommendations — general guidance on fit and between-sizes advice
- International conversions — US/UK/EU size equivalents
- Model reference — what size the model is wearing and their measurements
Measurement Types
Apparel (body measurements):
- Chest/bust, waist, hips, inseam (pants), shoulder width
Apparel (garment measurements):
- Chest width, body length, sleeve length, hem width
Footwear:
- Foot length in cm/inches, width (if applicable)
GATE: Present the guide structure and confirm measurements are complete before writing.
Phase 3: Build
Deliverables
1. Size Chart Table
| Size |
Chest (in) |
Waist (in) |
Hips (in) |
Length (in) |
| S |
34-36 |
28-30 |
34-36 |
27 |
| M |
37-39 |
31-33 |
37-39 |
28 |
| L |
40-42 |
34-36 |
40-42 |
29 |
| XL |
43-45 |
37-39 |
43-45 |
30 |
2. How to Measure Instructions
- Step-by-step for each measurement point
- What to wear while measuring (fitted clothing or underwear)
- Use a flexible measuring tape — not a ruler
- Stand relaxed, do not pull the tape tight
3. Fit Recommendations
- "This product runs true to size. Order your usual size."
- "Between sizes? Size up for a relaxed fit, size down for a fitted look."
- "Our model is 5'10", 155 lbs, wearing size M."
4. International Conversion Table (if applicable)
| US |
UK |
EU |
Chest (cm) |
| S |
S |
46 |
86-91 |
| M |
M |
48 |
94-99 |
| L |
L |
50 |
102-107 |
5. FAQ
- "What if I'm between two sizes?"
- "Do your products shrink after washing?"
- "How should I measure myself?"
Phase 4: Polish
Implementation Recommendations
- Link the size guide from every product page (not buried in the footer)
- Add a "Find Your Size" button near the size selector
- Mobile-optimized format (horizontal scroll tables or accordion sections)
- Consider a size quiz tool for interactive guidance
Return Rate Tracking
After implementing the size guide, track:
- Size-related return rate (target: 20%+ reduction)
- Size guide page views vs. return rate correlation
- Customer feedback mentioning sizing accuracy
Example 1: T-Shirt Size Guide (Unisex, S-XXL)
Body measurements in inches and cm, garment measurements for each size, "runs slightly oversized — if you prefer a fitted look, size down," model reference photo with size noted.
Example 2: Shoe Size Guide (US/UK/EU)
Foot length measurement instructions (trace foot on paper, measure longest point), conversion table for US Men's, US Women's, UK, and EU sizes, width guidance if applicable, note on break-in period.
Anti-Patterns
- Measurements without instructions — "Chest: 38 inches" is useless if the customer does not know how to measure their chest. Always include how-to.
- Body vs. garment confusion — mixing body measurements and garment measurements in the same chart without labeling creates returns. Label clearly.
- Missing between-sizes advice — most customers are between sizes. Tell them what to do.
- Hiding the size guide — a size guide nobody finds does not reduce returns. Make it prominent on every product page.
- One guide for different product types — t-shirts and pants need different measurements. Create product-specific guides.
Recovery
- No measurement data available: Order one of each size and measure them. Garment measurements are better than no measurements.
- Products vary across styles: Note sizing variation per style or provide a fit description per product (slim, regular, relaxed).
- International conversions are imprecise: Note that conversions are approximate and recommend measuring for best results.
- High return rates persist: Survey returners on their experience. The guide may be accurate but hard to find or hard to understand.
1---2name: size-guide3description: Creates product size guides with measurement instructions, comparison charts, fit recommendations, and international conversions. Use when reducing size-related returns.4---56# Size Guide78## When to Use This Skill910Use this skill when you need to:11- Create a size guide for apparel, footwear, or sized products12- Reduce return rates caused by incorrect sizing13- Build size comparison charts across international standards14- Write measurement instructions customers can follow at home1516**DO NOT** use this skill for product specifications, general product descriptions, or manufacturing size specs. This is for customer-facing size guidance.1718---1920## Core Principle2122EVERY SIZE GUIDE MUST ANSWER: "WHAT SIZE SHOULD I ORDER?" IN UNDER 60 SECONDS — IF CUSTOMERS GUESS, THEY RETURN.2324---2526## Phase 1: Brief2728### Required Inputs2930| Input | What to Ask | Default |31|-------|------------|---------|32| **Product type** | "What product needs a size guide? (tops, pants, shoes, accessories, furniture)" | Must be provided |33| **Size range** | "What sizes do you offer? (XS-XXL, numeric, one-size)" | Must be provided |34| **Measurements** | "Do you have garment measurements or body measurements for each size?" | Must be provided |35| **Fit type** | "How does the product fit? (true to size, runs small, runs large, relaxed, slim)" | True to size |36| **Markets** | "Do you sell internationally? (US, UK, EU sizing needed?)" | US only |37| **Return data** | "What percentage of returns are size-related?" | Unknown |3839**GATE: Confirm brief and measurement data before proceeding.**4041---4243## Phase 2: Design4445### Size Guide Components46471. **Size chart** — measurements mapped to each size482. **How to measure** — step-by-step instructions with body measurement points493. **Fit recommendations** — general guidance on fit and between-sizes advice504. **International conversions** — US/UK/EU size equivalents515. **Model reference** — what size the model is wearing and their measurements5253### Measurement Types5455**Apparel (body measurements):**56- Chest/bust, waist, hips, inseam (pants), shoulder width5758**Apparel (garment measurements):**59- Chest width, body length, sleeve length, hem width6061**Footwear:**62- Foot length in cm/inches, width (if applicable)6364**GATE: Present the guide structure and confirm measurements are complete before writing.**6566---6768## Phase 3: Build6970### Deliverables7172**1. Size Chart Table**7374| Size | Chest (in) | Waist (in) | Hips (in) | Length (in) |75|------|-----------|-----------|----------|------------|76| S | 34-36 | 28-30 | 34-36 | 27 |77| M | 37-39 | 31-33 | 37-39 | 28 |78| L | 40-42 | 34-36 | 40-42 | 29 |79| XL | 43-45 | 37-39 | 43-45 | 30 |8081**2. How to Measure Instructions**82- Step-by-step for each measurement point83- What to wear while measuring (fitted clothing or underwear)84- Use a flexible measuring tape — not a ruler85- Stand relaxed, do not pull the tape tight8687**3. Fit Recommendations**88- "This product runs true to size. Order your usual size."89- "Between sizes? Size up for a relaxed fit, size down for a fitted look."90- "Our model is 5'10", 155 lbs, wearing size M."9192**4. International Conversion Table (if applicable)**9394| US | UK | EU | Chest (cm) |95|----|----|----|-----------|96| S | S | 46 | 86-91 |97| M | M | 48 | 94-99 |98| L | L | 50 | 102-107 |99100**5. FAQ**101- "What if I'm between two sizes?"102- "Do your products shrink after washing?"103- "How should I measure myself?"104105---106107## Phase 4: Polish108109### Implementation Recommendations110111- Link the size guide from every product page (not buried in the footer)112- Add a "Find Your Size" button near the size selector113- Mobile-optimized format (horizontal scroll tables or accordion sections)114- Consider a size quiz tool for interactive guidance115116### Return Rate Tracking117118After implementing the size guide, track:119- Size-related return rate (target: 20%+ reduction)120- Size guide page views vs. return rate correlation121- Customer feedback mentioning sizing accuracy122123---124125## Example 1: T-Shirt Size Guide (Unisex, S-XXL)126127Body measurements in inches and cm, garment measurements for each size, "runs slightly oversized — if you prefer a fitted look, size down," model reference photo with size noted.128129## Example 2: Shoe Size Guide (US/UK/EU)130131Foot length measurement instructions (trace foot on paper, measure longest point), conversion table for US Men's, US Women's, UK, and EU sizes, width guidance if applicable, note on break-in period.132133---134135## Anti-Patterns136137- **Measurements without instructions** — "Chest: 38 inches" is useless if the customer does not know how to measure their chest. Always include how-to.138- **Body vs. garment confusion** — mixing body measurements and garment measurements in the same chart without labeling creates returns. Label clearly.139- **Missing between-sizes advice** — most customers are between sizes. Tell them what to do.140- **Hiding the size guide** — a size guide nobody finds does not reduce returns. Make it prominent on every product page.141- **One guide for different product types** — t-shirts and pants need different measurements. Create product-specific guides.142143---144145## Recovery146147- **No measurement data available:** Order one of each size and measure them. Garment measurements are better than no measurements.148- **Products vary across styles:** Note sizing variation per style or provide a fit description per product (slim, regular, relaxed).149- **International conversions are imprecise:** Note that conversions are approximate and recommend measuring for best results.150- **High return rates persist:** Survey returners on their experience. The guide may be accurate but hard to find or hard to understand.
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