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Which could be why one woman decided to try turning her bra into a mask instead - and the results are hilarious.
NHS administrator, Gemma Harman, 40, noticed the viral hack online and decided to recreate it herself.
In theory, the cup is supposed to be placed over the nose and mouth while the straps are intended to secure the cup in place.
But Gemma, who is a size 42FF, couldn't stop laughing when the bra ended up fitting over her entire head.
"I saw that people were wearing their bras as face masks," the mum, from Kent said.
"They were all very slender young women and their masks fit beautifully - nice and tidy over their noses and mouths.
"I don't think most women would be able to make their bra fit them so well as a face mask. I wondered what would happen if I tried.
"I am not young nor slender so I knew there was no way I was going to be able to do it. The cup covered my entire face.
"I would be really well protected because there's no way anything would be getting through it. Although I might end up with a couple of bruises from bumping into things. I couldn't see a thing."
Gemma explained she recruited husband Steve Harman, 45, to take some photos, before she posted them on social media for a laugh.
"Because I couldn't see, I had to get my husband to take photos of me. He couldn't believe he was taking photos of me with a bra over my head.
"When I posted them on Facebook, he had this look on his face as if to say 'here she goes again'. Steve is very sensible but I never take life too seriously and I'm always taking the mick out of myself."
Despite being a key worker, Gemma is in self-isolation as she suffers from diabetes which makes her more vulnerable to COVID-19.
And while she hoped to cheer up some of her Facebook friends, she never imagined the post would be shared 6,000 times.
"At first I posted just for my friends and everyone was commenting how hilarious it was and asking if they could share it so I made it public and it went crazy," she explained.
"I'm quite glad the bra covered my head because I had no makeup on and my hair was in a mum bun. I'm quite made up that my no makeup mum bun face didn't go viral.
"Everybody has found it really funny. It has been really nice to put some joy out there. Everyone needs something to laugh about at the moment.
"It's a really quite worrying time but you can't let it get you down so I'm trying to stay positive and keep cracking jokes."
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