Approximate Neck Measurements from Centre Buttonhole to Centre Buttonhole:

XSmall: 13.5in - 14in. (This is considerably smaller than the Small size as it is intended for women and boys)

Small: 15.5in - 16in

Medium: 16.5in - 17in

Large: 17.5in - 18in

XLarge: 18.5in - 19in

XXLarge: 19.5in - 20in

Sleeve length from nape to cuff:

XSmall 31in

Small: 34in

Medium: 35in

Large: 36in

XLarge: 37in

XXLarge: 38in

Approximate back length from Centre Back Neck to Hem:

Small 34.5in

Medium 35in

Large 36.5in

XLarge 37.5in

XXLarge 38in