United Kingdom Size 16–18 to US: L (12–14)
Cross-market women’s blouse, t-shirt, and sweater conversion mapping 16–18 specifications into L (12–14).

Analyzing Women’s Upper-Body Size Equivalence Across Markets
United Kingdom Size 16–18: Bust interval range of 97.8–104.1 (38.5–41 ), natural waist range of 76.2–82.6 (30–32.5 ), shoulder width of 41.3 (16.25 ), sleeve length of 80 (31.5 ), style variants Blouses, T-Shirts, Tank Tops, Sweaters & Cardigans, and fit classification Relaxed Comfort Fit.
US: L (12–14): Bust interval range of 97.8–104.1 (38.5–41 ), natural waist range of 76.2–82.6 (30–32.5 ), shoulder width of 41.3 (16.25 ), sleeve length of 80 (31.5 ), style variants Blouses, T-Shirts, Tank Tops, Sweaters & Cardigans, and fit classification Relaxed Comfort Fit.
Other Conversions to US: L (12–14)
United Kingdom Size 4–6 → us-l-12-144–6 to us-l-12-14
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United Kingdom Size 8–10 → us-l-12-148–10 to us-l-12-14
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United Kingdom Size 12–14 → us-l-12-1412–14 to us-l-12-14
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United Kingdom Size 16–18 → us-l-12-1416–18 to us-l-12-14
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United Kingdom Size 20–22 → us-l-12-1420–22 to us-l-12-14
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United Kingdom Size 24–26 → us-l-12-1424–26 to us-l-12-14
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United Kingdom Size 28–30 → us-l-12-1428–30 to us-l-12-14
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