I have serious trouble tape perfectly around the parameters - I wonder how people are doing it??

I am using contour tape for front, that makes life so easy, and hoenstly that is the only side that needs to be exposed so even the side/back are not taped perfectly, that's mostly fine.

But recently there are a couple of incident where somebody accidentally touched my side/back and asked what it was, it was embarassing.

I want to find ways to tape side/back perfectly as well so I can avoid these situations. Anyone can help which product I can buy?? Or shall I make a unit to fit a contour tape in the market?? -Thanks!!