Every HR manager orders too many mediums.
There's a reason and it's not the sizes.
Medium is the safe guess. It's the middle of a bell curve that doesn't actually exist.
Because real companies don't have a bell curve. We've shipped for 200 of them and the thing runs bigger than people expect, basically every time. Larges go first. Mediums sit.
Then the boxes show up, the mediums pile in a closet, and somebody in HR catches heat for a "bad order."
It wasn't a bad order. It was a guess in a nice suit.
So ask first. Or better, let people pick their own. Sizes sort themselves out when the person wearing the thing gets to choose it.
(This is the entire reason we build stores instead of bulk orders. Nobody has to guess.)