The biggest problem I’ve had with bibs is creases, not thickness.

Shorts like thr black bibs have a segmented chamois, so this creates creases if you’re skinny. I’ve had those creases basically cut in to me.

Regardless of shape or thickness, you have to be sure that the chamois is sitting flat against your butt. If it has to fold or rumple up to fit your derrière, it’s going to bother you on a long enough ride.