The chart below will give you the following information:
Largest Girth (Chest, waist or hips)
Inseam (Measured from crotch to floor)
Stockingfoot
S 35"-36" 31"-32" 7-8 M 39"-40" 33"-34" 9-11 MS 39"-40" 29"-30" 9-11 ML 39"-40" 35"-36" 9-11 MK 41"-42" 33"-34" 9-11 L 43"-44" 33"-34" 9-11 LS 43"-44" 31"-32" 9-11 LL 43"-44" 35"-36" 9-11 LK 45"-46" 33"-34" 9-11 XL 47"-48" 35"-36" 12-13 XLS 47"-48" 31"-32" 9-11 XLK 49"-50" 35"-36" 12-13 XXL 51"-52" 35"-36" 12-13 XXLS 51"-52" 31"-32" 9-11
