PI makes bib shorts with a "drop tail". The straps do not unhook, but the material separates at a key spot that allows you to take a potty break without having to take them off - I have these and they are great. PI is coming out with a second version of these for 2011 with a more advanced fabric/chamois - I went to a PI buying show this week at a LBS who wanted women's opinions on PI offerings.
TE also offers these, they have zippers.
I must admit I really liked what I saw of the new 2011 PI drop-tail bibs, but at over $200 for them I will likely just get a second pair of the less expensive version...



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