Shoes. Absolutely hate wearing shoes.

I wear trainers with my suit. In my younger days I used to make training software for the military, so would end up in various barracks every now and then for setup. After clocking the trainers, my escorts would usually diplomatically explain to me that I won’t be allowed in the mess hall for dinner unless I’d also brought some shoes with me.

I get why the military has these rules (it’s part of the whole thing), but have never understood why other people and places value shoes so much.