It might help if you were to describe the sizes instead of LR XLR. That doesn’t tell you much.
There is a size chart on the manufacturer page.
L = 35 - 39 inch waste
XLR = 39 - 43 inches I am assuming R is for regular length with an inseam of 29.5 to 32.5 inches
Here is a chart that will help you out! I have put it in the event also. Thanks!