I've gotten several jersey's on eBay over the past year.....stuff that would run $50 - $120 new and I've gotten them for $15-$40. In two cases, the jerseys were new with tags. I'm in the same place as the OP and now have a few things that I will sell since I have gotten smaller and they no longer fit correctly (beyond just looks, they feel uncomfortable due to being too big for me now).
Bibs? Only if they are new with tags (search eBay for "NWT"). But I've been able to find better sales on bibs and shorts at regular retail than I've found on eBay. Will I try and sell my own shorts/bibs? Sure, if someone else wants to buy them then that's cash in my pocket.