Yeah, your waist measurement doesn't help much because I would wear it much higher up*. I'm about 36-7 so I buy 38 / 96 to be sure of comfort these days. Now I've thought more about it, I need to know how long it is from the buckle to edge of the opposite side of the pad and also how long the trailing belt is.
Oh yeah, and I won the auction for this:
3x CREE XM-L T6 LED 3600 LM Lumens Waterproof Torch - £16 delivered ~ dove-xx
Imagine the strobe on this bastard!?!
EDIT: * what I mean is that i'm slimmer than my waist size higher up, especially when my back protector is pulled as tight as it needs to be for proper support.