That's the problem with current society -- people are drilled into thinking that breasts are a sexualized part of the female body, and thus needs to be covered. You'll have to excuse me, but I disagree entirely -- if we go by that, men shouldn't go shirtless on the streets either. And what to say about lactating mothers?
Current society is a piece of [parasitic bomb]. You can be a gentleman to ANY female on earth, no matter HOW she appears to you -- you just have to do the work yourself. Respecting a woman has absolutely nothing to do with social liberties; if a girl wants to go topless around town, that should not dwindle in any way a true gentleman's opinion of said girl -- rather, I'd respect them for it, for being true enough to their liberties and standing up to their beliefs and their freedom.