Yes. Tri clothes are the one place I often have to wear an M when I'm usually an S/XS. It seems to be worse with two piece sets (and wetsuits), the one pieces seem to be a little better. Some brands seem decent - I bought an Orca tri top off of steep and cheap that had what looked like regular sizing (we'll find out...).

I don't have any PI tri stuff, but it's definitely the case with Zoot, too.

Also, what's with the tops being so SHORT? I'm short and the tops are short on ME.