Underwear - Waist Size Small - 31 1/2" - 33 3/4inches / 80-86 cms
Medium - 33 3/4" - 37 3/4 inches / 86-96 cms
Large - 37 3/4" - 42 1/2 inches / 96-108 cms
Extra Large - 42 1/2" - 45 3/4 inches / 108-116 cms

Shirts - Chest Size Small - 34 1/2 inches / 88 cms
Medium - 36 1/4 inches / 92 cms
Large - 37 3/4 inches / 96 cms
Extra Large - 39 3/4 inches / 100 cms