That depends. Do hands count?
So, if she asks the OP to break eye contact, it’s acceptable for him to look at her boobs? 
Hey, CWG, what were you wearing?
Stare at her eyes instead :smack: Why didn’t I think of that?!?!
I took the question to ask if the starer is being harrassed by being forced to look, for a sexual reason, somewhere they didn’t want to look.
That depends. Were they covering the nips?
Thread Winner
(and personal favorite)
Bazinga !
I was starting to think, Hey this guy ain’t checkn’ out my sisters time to take it up a notch and lets wear this today while leaning over a lot. She’ll never catch me peaking.
Imma take a stab here and guess that you’re female… 
Yep, absolutely it’s sexual harassment - there’s no way you should be having to consciously avoid looking at her breasts, so she can damn well cover them up and make your workplace less hostile.
I’m probably a troglodyte, but my attitude is that if a woman dresses in a way that deliberately emphasizes her breasts, then she wants you to look. If she dresses otherwise, then probably not. I recall a friend of mine, in about 1955, whose (quite well-endowed) wife complained to her husband that people had been staring at her see-through blouse all day. He replied, quite reasonably it seemed to me, that if she was wearing a see-through blouse, she was inviting them to stare.
I know a woman mathematician who is spectacularly beautiful. She wears baggy and unflattering clothes and, although I am not certain of this, it is because she wants to be taken seriously as a mathematician. And it works too. I guess it’s a shame it is that way, but it is unavoidable. I never give a thought to what I wear, but women do.