| name | size-guide |
| description | Creates product size guides with measurement instructions, comparison charts, fit recommendations, and international conversions. Use when reducing size-related returns. |
| allowed-tools | Read Write Glob |
| metadata | {"author":"matthewhitcham","version":"1.0"} |
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.
