All different types of open bras. To me, a quick glance is okay, but staring is rude. Also, I doubt the bank teller cares about you or wants you to eye-fuck her. I could totally tell she noticed me looking at her boobs, but she seemed to enjoy the attention. I don't want to be stared at, but I'm resigned to it, and if I caught a guy looking I'd probably be mildly amused. I'm proud of my body and it feels good to wear things that show that.