Used to be Vanity Sizing only messed up the woman's clothing market. But now it's infected men's clothing as well.
Phrases like "relaxed fit" are only the first clue. There are now all kinds of tricks to telling what the actual size will be. If you see any kind of adjustments or elastic you can be sure they will be super oversized to make men feel better about their growing girth.
All this makes it brutally hard to buy clothes that fit based on measurements!
The sad part is, I don't think we can turn back. Consumers love the idea of wearing a smaller size than their real measurement, so like the marching morons with their speedometers that lie, we keep buying the vanity sizing.