^ this. The tops are pretty much spot on but I have one pair of bibs that leave marks, they are so tight, and another set in the same size which are almost too big. A bit of a lottery really.
Yeah. Weirdo sizing on bibs accross the range - some fit really well others give me terrible saddle sores. I've even got nano shorts and nano tights - the fit is completely different between the two. Go figure..
Castelli jerseys fit true to size for me, it's their bib shorts that you need to be careful with sizing.