In days of yore, some knights liked to play a game of frilly dress up under their armor, wearing items like this where no one could see. No, not really. At least I hope not.
This is the BraDryer concept, designed to dry wet boob holsters. It’s shape tells the story of what it does. One can only guess that it will come in varying sizes to cater to different bra sizes, or maybe it’s a OSFA situation. We don’t know. We just like boob gadgets.