The Tesco superstore in St. Mellons, Cardiff, Wales is the first British supermarket to introduce a dress code, according to the paper.
"To avoid causing embarrassment to others we ask that our customers are appropriately dressed when visiting our store (footwear must be worn at all times and no nightwear is permitted)," signs posted at the store's entrance reportedly say.
Staff members told the paper they put up the signs in response to mothers doing their shopping in pajamas after dropping their kids off at school.
While we stopped wearing our flannel jammies to pick up milk back in college (don't judge), some Tesco customers are demanding their right to a supermarket slumber party.
"It is ridiculous and stupid," 24-year-old PJ-clad mom Elaine Carmody, who was asked to leave by a security guard, told the paper.
"I've got lovely pairs of pajamas, with bears and penguins on them. I've worn my best ones today, just so I look tidy.
"I walked in with my trolley [shopping cart] and the security guard came over and told me to leave. He said it offends people. But I've never seen anyone offended.
"You see loads of people going in wearing jogging bottoms, what's the difference?"
"This is just pathetic and shows how snobbish some people can be," another disgruntled shopper reportedly said.
This isn't the first time pajamas have been battled across the pond (and who can forget Shanghai's attack on sleepwear in public?). Belfast school headmaster Joe McGuinness recently ruffled feathers when he posted a notice saying that parents coming to pick up or drop off their children in pajamas were "slovenly and rude," according to the Daily Mail.
Okay, okay, we're getting dressed!
But what do you think? Is wearing PJs in public harmless, or an offensive fashion faux pas? Leave a comment!
Meanwhile, read about this British swimming pool's strange new dress code.
Shop these cozy pajama styles below.