When I got married, during the "Family" wedding ceremony where our families showed up and everything was done as usual, my Bridesmaids, Maid of Honor and I did not wear any undies.

We had a real wedding ceremony the day before though with only a few people. The reason for that was because it was more explicit. Aside from a few key items (all white veil, stockings/garter, corset, heels for me. Stockings/garter, heels for them) my Bridesmaids, Maid of Honor and I were all nude. Instead of "you may now kiss the bride" I knelt down and gave him a blowjob. He came on my face and I left it there the rest of the time. During the actual ceremony, my bridesmaids were to kneel in front of his groomsmen with their heads near the guys' crotches, and if they felt comfortable with it they were allowed to give the man they were in front of a blowjob as well (Marie started first, which sort of convinced Laura and Claire to do it). What ended up not being optional was that my Bridesmaid had to blow his Best Man. It took a bit of prodding but I managed to convince her. As we went to the limo, I crawled on my hands and knees. And instead of throwing rice, everyone I passed was allowed to swat my ass with a paddle to a ping pong set.

All in all I couldn't imagine my wedding going any more perfectly, and I would do it again the same way if I had to.