I showed up to my interview at Best Buy in Ithaca, NY in shorts and was immediately rejected. I was a rising senior in high school and was really into building computers, so thought I was a shoe-in. The hiring manager told me it was insulting to not dress up for the interview. Honestly it was just something I didn’t even think about, but certainly taught me a lesson of sorts. Now I interview people every week and they’re all in t-shirts.