As someone who made understanding clothes sizes my main nerd-quest of recent years (see my other comment, lol) , I can confirm that no, men's clothes are not standard either. In some ways they're better, in some ways worse - like, it's one thing for a medium to have a lot of variation, but I would expect waist or leg sizes that are measured in inches to be more consistent.
Alas, finding well fitting clothes sucks for everyone (though ofc, it sucks for some people more than others)