An Althouse observes and asks, "It's a miracle the fashion industry stays alive. If we — or I mean, you men — didn't have to get dressed up for work, what would you spend a year?"
Well, at my current running pace (30-35 miles per week), I can expect to burn through about 2-3 pairs of running shoes in a year, and those things run about $70-100 each. And then it's always hard to resist getting new running apparel, like moisture-wicking tech shirts and shorts. And running socks. And funny running-themed shirts, like the "zombies hate fast food" one that I have. And some cold weather outdoor running gear, like gloves and waterproof windbreakers.
So yeah, I'd still buy clothing if I didn't have to get suits, shirts, and ties for work. (Well, I don't really have to wear a suit to teach; that's a choice I make. But I feel better prepared to teach when I'm wearing a suit.)