United Kingdom Size 42–44 to US: XS (32–34)
Cross-market men’s shirt and upper-body conversion mapping 42–44 specifications into XS (32–34).

Analyzing Upper-Body Size Equivalence Across Markets
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.
US: XS (32–34): Corresponds to a chest width of 81.3–86.4 (32–34 ), neck collar girth of 35.6 (14 ), sleeve length of 81.3 (32 ), and fit style Slim Tailored Fit.
Other Conversions to US: XS (32–34)
United Kingdom Size 32–34 → us-xs-32-3432–34 to us-xs-32-34
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United Kingdom Size 35–37 → us-xs-32-3435–37 to us-xs-32-34
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United Kingdom Size 38–40 → us-xs-32-3438–40 to us-xs-32-34
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United Kingdom Size 42–44 → us-xs-32-3442–44 to us-xs-32-34
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United Kingdom Size 46–48 → us-xs-32-3446–48 to us-xs-32-34
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United Kingdom Size 50–52 → us-xs-32-3450–52 to us-xs-32-34
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United Kingdom Size 54–56 → us-xs-32-3454–56 to us-xs-32-34
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