To pile on with my own anecdote:

I used to work at a mega investment bank, and most days, I saw at least one woman dressed like a hooker. Classy and expensive ones, I guess, but still, I could basically see right up their asscracks through their skintight legging-pants or microdresses. Obviously this kind of sexual display is going to have an effect on the monks, bankers, or whoever's trying to get some goddamn work done around them - that's why they do it. Hence, dress codes.