Contribute

Help make size matching more accurate. Whether you've found an error, have measurements from a brand we don't cover, or want to add a new clothing category — we'd love your input.

Ways to Contribute

1. Correct existing data — Measured a garment and found our numbers off? Submit a correction.
2. Add a new brand — Create a brand JSON file following the schema below.
3. Add a category — Extend an existing brand with a new clothing type (e.g., trousers, jackets).
4. Report issues — Found a bug or UX problem? Open an issue on GitHub.

Brand Data Schema

Each brand has its own JSON file in the data/ directory. Here's the schema:

{
  "brandId": "your-brand",
  "brandName": "Your Brand",
  "lastUpdated": "2026-02-12",
  "source": "Description of measurement source",
  "categories": {
    "casual-shirts": {
      "name": "Casual Shirts",
      "gender": "men",
      "sizes": {
        "M": {
          "chest":    { "min": 102, "max": 106 },
          "shoulder": { "min": 46,  "max": 48 },
          "waist":    { "min": 92,  "max": 96 },
          "sleeve":   { "min": 64,  "max": 66 },
          "length":   { "min": 74,  "max": 76 }
        }
      }
    },
    "jeans": {
      "name": "Jeans",
      "gender": "men",
      "sizes": {
        "32": {
          "waist":  { "min": 81, "max": 83 },
          "hips":   { "min": 99, "max": 101 },
          "inseam": { "min": 81, "max": 83 }
        }
      }
    }
  }
}

Key Rules

• All measurements in centimeters
• Measurements are garment measurements (not body measurements)
• Each dimension is a min/max range to account for manufacturing tolerances
• Use brandId as the filename: your-brand.json
• Category IDs must match those in brands-index.json

Dimensions by Category

Category	Dimensions
casual-shirts	chest, shoulder, waist, sleeve, length
t-shirts	chest, shoulder, waist, sleeve, length
jeans	waist, hips, inseam

How to Submit

1. Fork the repository
2. Create or edit the brand JSON file in data/
3. Update data/brands-index.json if adding a new brand
4. Validate your JSON (no trailing commas, correct structure)
5. Open a pull request with:
   • Source of your measurements (URL, personal measurement, etc.)
   • Date of measurement
   • Any notes on fit type (slim, regular, relaxed)

Measurement Tips

If you're measuring garments yourself:

• Lay the garment flat on a hard surface
• Use a flexible measuring tape
• Double the half-chest measurement for full chest
• Measure multiple items of the same size if possible and average the results
• Note the specific product/style name, as cuts vary within brands