Kind of a coin-toss what I love about this most…

… but I think it’s maybe that this patent was issued in 2007, and still looks so damned olde-tyme Cold War Fallout™ goofy. Patent diagrams are their own artistic genre, and I love it:

image of patent application for bra that converts to particulate-filtering face masks

Incidentally, as it turns out bra pads actually make pretty decent DIY face masks for coronavirus.

(all props to Harper’s for the image)