i think there are actually some people who look better as being a bit chubby, I don't know about the guys but to me a girl that's too skinny ain't all that pretty, I mean what's there to hug with all the bones sticking out?
but personally overweight in my opinion is anyone where you can see like the flabs, I mean w/e just don't wear tight clothes but when you can actually see the folds on the back I'm sorry but that ain't sexy. or like today I saw an obese woman with a mini skirt. once again sorry but please don't rape my eyes that way (so ye in terms of attraction it does matter what you wear). but those are extremes, if you are that fat then you should be more concerned about your health than how you look> you should check out your
link it's how they say, if you love yourself, so if YOU think you are not fat, then you are confident and that is what people see, but if you are self-conscious then they might notice a bit of blub.
personally I think no matter your weight, in order to be attractive you should try to keep your upper arms (the whole bat wings look, not cool with tanktops) and belly toned, and do some squats to keep your thighs tight, it doesn't have to be perfect just not exactly hanging there.