Women's Underwear Size Guide: Creating Inclusive Size Charts for Global Markets
📋 Direct Answer: Women's Underwear Size Guide: Creating Inclusive Size Charts for Global Markets International underwear sizing requires country-specific charts: US XS-4XL equals UK 6-18 and EU 34-46, but hip measurements differ by 2-3cm between systems.
International underwear sizing requires country-specific charts: US XS-4XL equals UK 6-18 and EU 34-46, but hip measurements differ by 2-3cm between systems. Standard grading adds 5cm between sizes at waist and hip. Plus sizes need non-linear grading for proper fit.
Inclusive sizing has moved from trend to requirement in women’s underwear. Brands offering XS-4XL capture 90%+ of the addressable market, while those stopping at XL miss nearly 40% of potential customers. Here’s how to create truly inclusive size charts for global markets.
The Business Case for Inclusive Sizing
Key Insight: International women's underwear sizing requires country-specific conversion charts: US XS-4XL equals UK 6-18 equals EU 34-46, but hip measurements differ 2-3cm between systems. Standard grade rules add 5cm per size at waist and hip. Plus-size grading (14W+) requires non-linear grade rules — hip increases by 7-8cm per size while waist increases by 5cm — because body proportions change at larger sizes. Women’s OEM →
67% of US women wear size 14+, yet only 18% of underwear brands offer extended sizes. The plus-size underwear market is $12 billion in the US alone. Beyond revenue, inclusive sizing drives brand loyalty — women who find their size become 3x more likely to repurchase.
Technical Grading for Extended Sizes
Standard grading (2 inches/5cm between sizes) does not work for plus sizes. Extended grading requires non-linear progression: larger grade at hip, smaller grade at waist, deeper rise, and wider elastic at waistband and leg openings. Fit testing on plus-size fit models is non-negotiable.
Size Chart Design Best Practices
Include waist, hip, and weight recommendations — not just dress size equivalents. Use photographs of diverse body types. Provide fit notes: Runs true to size, If between sizes, size up. Include measurement instructions with diagrams.
Global Size Conversion
US 14 = UK 18 = EU 44 = AU 18. But hip measurements differ: US 14 hip is approximately 43 inches (109cm), while EU 44 hip is approximately 106cm. Always provide measurements in both inches and centimeters. Contact Unitex for inclusive size OEM development.
Related: capabilities →
· Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013.