💡 Instant Size Formula:
Measure your bust across the fullest point with a soft tape. If your bust is 36 inches, buy BIBA Size 36 (Medium). BIBA already includes 2 inches of garment ease, meaning the actual garment measures 38 inches across the chest for a comfortable drape.
The number one reason for online ethnic wear returns is choosing the wrong size. Sizing standards vary across brands, but BIBA uses an intuitive inch-based numbering system.
Official BIBA Size Conversion Chart
| BIBA Number | Alpha Size | Bust (Inches) | Waist (Inches) | Hip (Inches) |
|---|---|---|---|---|
| 32 | XS | 32″ | 26″ | 36″ |
| 34 | S | 34″ | 28″ | 38″ |
| 36 | M | 36″ | 30″ | 40″ |
| 38 | L | 38″ | 32″ | 42″ |
| 40 | XL | 40″ | 34″ | 44″ |
| 42 | XXL | 42″ | 36″ | 46″ |
| 44 | 3XL | 44″ | 38″ | 48″ |
| 46 | 4XL | 46″ | 40″ | 50″ |
When Should You Size Up?
- Non-Stretch Silk or Jacquard: Silk weaves have zero natural stretch. If your bust is 36.5 inches, always size up to 38.
- Broad Shoulders: If you frequently experience armhole tightness, sizing up ensures shoulder freedom.
Check out the full range on the Amazon BIBA Brand Store.