ad for Unitia video game with 4 girls anime style on bottom left is a white haired girl with her midriff and underboob bare, with white cloth cap things on top of her breasts just covering her nipples

Caption Contest: what's going on with the boob napkins?

Reposting this one from last week because there was a problem publishing scheduled posts on the site and I wanted to give people another chance to give their caption for what's going on with the white haired girl's boob napkins(?), what they are, what their function is, or whatever.

Best/funniest ideas will get published in the future and I'll give a little prize for the best one!

(Ad for Unitia, DMM Games)