That isn't just wearing a low cut dress though is it?
A) She's got VERY big tits.
B) They hang very low. Unsurprising given A.
C) That dress isn't low cut. Its practically frontless.
Now all that is technically (if not aesthetically) fine.
However if you're going to try to tell me that she really doesn't realise that points A,B and C in combination make for a very unusual and unpleasant combination then you're actually being quite insulting to her, because to NOT realise then she'd have to be either thick, or live in a box.
Braless - not unusual.
Big tits - ditto.
Saggy tits - ditto.
Braless, saggy and HUGE - at an event where you're supposedly trying to look your best - not so usual.
She'd have to have the IQ of an amoeba to not realise she'd get attention. She got it.