How to choose the right size of G.Inglese Saharian shirts

TUTORIAL

SAHARIANA SIZE XS S M L XL
CHEST CIRCUMFERENCE 103.0 109.5 116.0 122.5 128.5
SHOULDERS 40 42 44 46 48
SLEEVE LENGTH* 66.5 68.0 69.5 71.0 72.5
BACK LENGTH**  73 75 77 79 81
WAIST CIRCUMFERENCE 95 101.5 108.0 114.5 120.5

Measures in cm

*Lenght Sleeve : Measure from the shoulder to the end of the cuff.
**Back lenght from collar attachement.