US: XL (46–48) to United Kingdom Size 42–44
Cross-market men’s shirt and upper-body conversion mapping XL (46–48) specifications into 42–44.

Analyzing Upper-Body Size Equivalence Across Markets
US: XL (46–48): Corresponds to a chest width of 116.8–121.9 (46–48 ), neck collar girth of 44.5 (17.5 ), sleeve length of 91.4 (36 ), and fit style Generous Full Fit.
United Kingdom Size 42–44: Corresponds to a chest width of 106.7–111.8 (42–44 ), neck collar girth of 41.9 (16.5 ), sleeve length of 88.9 (35 ), and fit style Comfort Fit.
Other Conversions to United Kingdom Size 42–44
US: XS (32–34) → uk-42-44XS (32–34) to uk-42-44
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US: S (35–37) → uk-42-44S (35–37) to uk-42-44
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US: M (38–40) → uk-42-44M (38–40) to uk-42-44
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US: L (42–44) → uk-42-44L (42–44) to uk-42-44
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US: XL (46–48) → uk-42-44XL (46–48) to uk-42-44
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US: 2XL (50–52) → uk-42-442XL (50–52) to uk-42-44
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US: 3XL (54–56) → uk-42-443XL (54–56) to uk-42-44
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