Sports footwear is interesting.

Football (soccer) boots tend to be extremely narrow. Part of the reason is to keep the foot firm in it, but I suspect a lot of players would benefit from wider boxes.

Climbing boots are another interesting one. I can't wear most brands at all. I have settled on Scarpa as they tend to be wider. A lot of climbers have a tendency to downsize them massively though, and I honestly don't know how they do that. I have been purchasing them at least at my street size, and the next pair I get will be a whole number up. Not because they're just uncomfortable, but rather because they're nearly impossible to get in otherwise. I do wish I'd find wider toeboxes though, so I could get a pair that fits tight, but not torture tight.