As a 5’5 dude buying clothes from American brands is often hilarious. I bought an xs nike trail running tshirt and it’s a good 5 inches too long in the body.

Small people can use child size, which is usually much cheaper for the same thing.

Large people are out of luck.

But your point still holds, it is just that if you include children, small sizes don't follow a normal distribution, large sizes do.