Measurements are in inches with shirt laying flat ( actual shirt measurements )
Small
Body Width 16”  ( 40cm ) / Body Length  26" ( 66cm )
Medium
Body Width 18” ( 46cm ) / Body Length  28" ( 71cm )
Large
Body Width 20.5" ( 52cm ) /  Body Length 29" ( 73.5cm )
Extra Large
Body Width 22" ( 56cm) / Body Length 30" ( 76cm )
2X-Large
Body Width 24” ( 61cm ) / Body Length 31" ( 78.5cm )
3X-Large                                                          
Body Width 26" ( 66cm ) / Body Length 32" ( 81cm )    

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Recommended size chart
Unisex body
Small
Bust 32-35” (81-89cm) / waist 24-27” (61-68.5cm)

Medium
Bust 36-38” (91-96.5cm) / waist 28-30” (71-76cm)

Large
Bust 39-41” (99-104cm) / waist 31-33” (78.5-84cm)

Extra Large
Bust 42-44” (106.5-112cm) / waist 34-36” (86-91.5cm)

2X-Large
Bust 45-47” (114-119cm) / waist 37-39 (94-99cm)

3X-Large
Bust 45-47” (114cm-119cm) / Waist 38-40”(96.5cm-101cm)