May be it is according to your point of view..but i completely disagree with it.Abaya is usually worn on top of other outfits,its not the only thing a woman wears right on top of her skin. Alhamdulillah i have been wearing veil since i was 17 years old and its been a couple of years now,Alhamdulillah in the whole time by the grace of Allah not a single stranger ever tried to touch me while the same was not true for my peers who didn't wear the veil but some wore the hijab while some not,but still they would be the prey of the dirty gazes of men..sometimes touches..sometimes dirty sexual comments.Alhamdulillah in those times i thanked Allah for His guidance. May Allah forgive me if i said anything wrong and guide the entire humanity to righteousness.
It's not according to my point of view. Those are those statistics, and that's the research. It's common sense. It's easier to grab someone when they have something TO grab. Tight clothing is harder to grab than loose clothing.