I used to work at a big bank, and would just wear nice dress shirt/dress pants. Whenever I saw a "vest" guy I would think 1) you guys really all look the same, and 2) aren't your arms cold and your torso hot?
I now work at a SV fintech, and it's impossible to figure out what to wear to meetings. Do I wear biz causal? Shirt tucked or untucked? Jeans and t-shirt? Sneakers, loafers, leather sneakers? Can I wear shorts? Does it matter if you're in SF or NYC?
One of my summer jobs in high school was that of "towel boy" at the swim and tennis building of a country club. My only job was to sit in front of the towels, make the guests sign the clip board, and count how many towels they took. I wasn't allowed to read or do anything because I was told it would look bad, so I literally sat in a chair all day holding a clipboard. I got so bored that for amusement I would write down 100 random digits, memorize them, and recite them to some of the kids running around.