US: S (4–6) to United Kingdom Size 4–6
Cross-market women’s blouse, t-shirt, and sweater conversion mapping S (4–6) specifications into 4–6.

Analyzing Women’s Upper-Body Size Equivalence Across Markets
US: S (4–6): Bust interval range of 86.4–90.2 (34–35.5 ), natural waist range of 64.8–68.6 (25.5–27 ), shoulder width of 38.1 (15 ), sleeve length of 77.5 (30.5 ), style variants Blouses, T-Shirts, Tank Tops & Sweaters, and fit classification Slim Tailored Fit.
United Kingdom Size 4–6: Bust interval range of 80–85 (31.5–33.5 ), natural waist range of 58.4–63.5 (23–25 ), shoulder width of 36.8 (14.5 ), sleeve length of 76.2 (30 ), style variants Tank Tops, Camisoles, Slim T-Shirts & Fitted Sweaters, 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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