They're literally conspiring against you

https://lemmy.world/post/35273154

I’m very glad men’s pants and shorts are done by waist measurement, and is an actual measurement.

Shirt sizing has been pretty consistent as well, in my experience.

Maybe if you’re getting it tailored or something but off the shelf it can be a crapshoot for us, too. I have “32” jeans that range from hanging off me to I can’t wear them comfortably.
This is why a lot of men find one brand and stick to it until they die.
I’ve never had a medium shirt that didn’t fit me.