Someone’s way ahead of you.
An Ig Nobel Prize has been awarded for:
PUBLIC HEALTH PRIZE: Elena N. Bodnar, Raphael C. Lee, and Sandra Marijan of Chicago, Illinois, USA, for inventing a brassiere that, in an emergency, can be quickly converted into a pair of protective face masks, one for the brassiere wearer and one to be given to some needy bystander.
REFERENCE: U.S. patent # 7255627, granted August 14, 2007 for a Garment Device Convertible to One or More Facemasks.
WHO ATTENDED THE CEREMONY: Elena Bodnar.
https://patents.google.com/patent/US7255627?oq=7255627
Clever!
Damn! Well, there's always the individual mask made from an athletic supporter.......