What’s up with the PJ’s?

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When did pajamas become the popular thing for girls to wear to the supermarket? Is this an Austin phenomenon, or are women around the country all putting on their PJ’s to go shopping? At first I thought it was just a college thing (Austin is home to UT), but then I started seeing women in their 30’s and 40’s wearing pajama bottoms to the market and started to wonder. Part of me thinks that as a guy, I should be all over it, but mostly I think it’s kind of gross. I am not sure why, though.