Not judging (I think he’s great!) but this is probably some mixture of 1) social signaling (here’s how much I care about old fashioned traditional dress codes,

Not judging (I think he’s great!) but this is probably some mixture of 1) social signaling (here’s how much I care about old fashioned traditional dress codes, and, look, I have the sufficient status that I can get away with wearing this) and 2) just plain fun. Maybe heavily weighted on #2, but #1 is also fun.