By now, I never leave the house without a face mask. I even stash extras in my car, and at home I have a wide variety of coverings in different patterns and colors. Even so, I’ve never considered doubling up and wearing two masks at once — until I watched the Presidential Inauguration on January 20. Like me, you may have spotted several attendees and key speakers — including poet Amanda Gorman — wearing not one, but two masks. The first layer...