I want to get some GBW shorts. Tried on a pair a while back and the crotch felt really good compared to other shorts I've tried.

I thought I'd just have a look at their sizing chart to see if the size I was trying was what they rekon I should be in and it completely threw me. Every measurment going round my body says I should be a small, one of two even say I'm below a small. My inseem then says I should be a large. Which measurement should I go with for shorts. I'm not sure I'll be able to try on every size.