stock sizes don't exist
size chart on the tumblr is outdated
just make sure to take good measurements of yourself and specify exactly how you want it to fit (if you like ironknochs' fit so much, just straight up link Charly to it)
also make sure to trust him and only modify something if you're 110% confident in what you're doing
Is it really outdated?
You can't even use it as a guide line?