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Men's Size M to Chest Clothing Size

Size M = Chest 40in
Chest ~40 in (102 cm) · EU 50

Full equivalents and the body measurements that actually determine fit:

IntlUS/UKEUChest (in)Chest (cm)
XS344434"86cm
S364636"91cm
M405040"102cm
L445444"112cm
XL485848"122cm
XXL526252"132cm
⚠️ Labels are shorthand — brands vary by up to a full size. The body measurement is the real answer. Measure yourself and check the brand's own size chart before ordering; designer labels in particular often run a size smaller than high-street brands.

Convert any other size with the live clothing size converter.

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