i'd say in a run of like 30, there was maybe 10. more of the issue was that since nothing negates it, i couldn't do the blueberry potion on the next adventurer. maybe a circlet or necklace or something let's adventurers speak telepathecally, so it'd be a waste to use the lip potion on them.
as for the bra, i found it rather obvious. rougue had nothing pop over their arm, wizard looked like they had a muscular chest, and warrior just didn't look right. i loved watching them go from nothing to something to a whole lot.