my last job was SUPER casual. Like, most people wore workout clothes because working out at lunchtime or after work was encouraged.
when i started this job, I said I wasn't going to wear jeans ever. But, most everyone else is so casual half the time, that now I am too. So every other day or so I wear jeans (nice ones, with boots or heels) and a sweater or a sport jacket. I know i should probably do that less, but i love jeans.
also, i'm the only creative person at my company, so even though i'm management, nobody expects me to be normal.