I was considering 'stickiness' of the various patches the other day. My girlfriend and I like to take baths together and we usually have a bath bomb...heavenly, btw...
Anyway, most bath bombs have a lot of softening oils in them. I had found that the combination of really hot water and the oils actually would start the edges of my patches to start lifting. Because of this, we started to limit our baths to right before a patch change out. Oh the price we pay!
So one day I was walking around the house wearing my tight'ish bikini bottom and decided to leave it on to see if it would help with keeping the patches secure...whala! It worked!
So, if you are concerned about your patches moving around while bathing, maybe a tight pair of panties or the like would be helpful