Yes, I look. Sometimes it is hard to avoid such as when you are standing at a high counter and the person behind the counter is bending over to work at the lower desk height counter-top in front of you, then you have a quick look and find something else to do or look at so as not to make either of you uncomfortable.
Surely it must occur to the ladies who know they are working in a situation like this every day that if you wear a low neckline top and a loose bra, knowing you are going to be bent over several times a day assisting customers, there is going to be some flashing going on. But it doesn’t bother some I guess.
I know my wife has said that her employees have mentioned many times that when drawing blood, with the patient seated and them standing, they have looked up to find patients, both male and female, staring down their scrub tops. She’s had it happen to her and, according to her, “I don’t even have anything to look at!”.