You will get all the info you need in plenty of time. I know it is tough time of waiting, HURRY UP, waiting, EMERGENCY HURRY UP, waiting.
In my sons' time, the measurements had to be done by a tailor or similar professional. It really helped my sons because as fencers, they were SUPER THIN (still are!), but their thighs were "thicker" than others' their weight/height.
Please don't stress.