United Kingdom Size 16–18 to US: XS (0–2)
Cross-market women’s underwear, panty, and thong conversion mapping 16–18 specifications into XS (0–2).

Analyzing Women’s Underwear Size Equivalence Across Markets
United Kingdom Size 16–18: Waist contouring range of 76.2–81.3 (30–32 ), full hip range of 101.6–106.7 (40–42 ), style variants Briefs, High-Waist Panties & Boy Shorts, and fit classification Comfort Stretch Fit.
US: XS (0–2): 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 US: XS (0–2)
United Kingdom Size 4–6 → us-xs-0-24–6 to us-xs-0-2
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United Kingdom Size 8–10 → us-xs-0-28–10 to us-xs-0-2
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United Kingdom Size 12–14 → us-xs-0-212–14 to us-xs-0-2
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United Kingdom Size 16–18 → us-xs-0-216–18 to us-xs-0-2
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United Kingdom Size 20–22 → us-xs-0-220–22 to us-xs-0-2
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United Kingdom Size 24–26 → us-xs-0-224–26 to us-xs-0-2
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United Kingdom Size 28–30 → us-xs-0-228–30 to us-xs-0-2
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