When I got mine done I found wearing a bra felt better then not.I found that having the t-shirt rub up against them when they were still tender hurt as opposed to the bra not moving that much. I put a Kleenex in front of each nipple in my bra in case they did bleed but they really didn't. Just a tiny bit about 2 minutes after they were first done.
kev did our friend andreas and, the next day she went went riding (atv riding) the next day with us (a group run) and her nips bled pretty hardcore she said. she gets off to the atv vibrations, especially dirtbikes, so she didnt feel the nips 'hurting' per say, but afterwards they were sore, and bleeding