US: XL (16–18) to United Kingdom Size 4–6
Cross-market women’s underwear, panty, and thong conversion mapping XL (16–18) specifications into 4–6.

Analyzing Women’s Underwear Size Equivalence Across Markets
US: XL (16–18): Waist contouring range of 83.8–88.9 (33–35 ), full hip range of 109.2–114.3 (43–45 ), style variants Full Briefs, High-Waist & Boy Shorts, and fit classification Generous Full Fit.
United Kingdom Size 4–6: Waist contouring range of 58.4–63.5 (23–25 ), full hip range of 83.8–88.9 (33–35 ), style variants Thongs, Bikinis & Cheeky Cuts, and fit classification Petite Contour Fit.
Other Conversions to United Kingdom Size 4–6
US: XS (0–2) → uk-4-6XS (0–2) to uk-4-6
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US: S (4–6) → uk-4-6S (4–6) to uk-4-6
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US: M (8–10) → uk-4-6M (8–10) to uk-4-6
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US: L (12–14) → uk-4-6L (12–14) to uk-4-6
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US: XL (16–18) → uk-4-6XL (16–18) to uk-4-6
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US: 2XL (20–22) → uk-4-62XL (20–22) to uk-4-6
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US: 3XL (24–26) → uk-4-63XL (24–26) to uk-4-6
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