The tropical combat uniform was developed in the early 1960's, partly inspired by the WWII parachutists uniform. The first pattern had exposed buttons.
S: 30"-33"
M: 34"-37"
L: 37"-40"
XL:42"-44"
XXL: 44"-46"
Note: Please measure your actual waist just below navel level in inches and order that size and do not order your Jeans size.
These trousers have size adjustment tabs at back to adjust waist 3 inches up/down. Size small will give you 30 inches on tightest side(buttoning up the tab) and 33 inches on loosest side by unbuttoning the tab.