Rivendell has suspenders.

http://www.rivbike.com/webalog/clothing/22391.html

I have one pair of bib tights - Castellis. I only wear them for short rides. They're very warm and getting them off to use the bathroom is a pain. The quality of the ankle zippers is pretty poor. Granted I have mondo sized calfs, but you'd think that for what I paid for the tights, they would stay closed. I haven't worn them at all this season.

V.