Clothes are only a finishing touch to your visual appeal.
Wearing a five hundred dollar Gucci cocktail dress when you have enough love handles to send an unholy shiver up the spines of most people is probably not a good idea. Likewise, wearing things that are not consistent with your intrinsic body image is not a good idea too. Working on your physique is probably the better off option here. When your body looks good, chances are, it will look good in anything. :)
Depends on the body type. If you have the body to rock a miniskirt or a tight dress, go for it, but a girl a little bigger can look just as attractive if she's dressed in a pair of jeans, a sweater or tshirt and a beautiful smile. Don't be afraid of overdressing a little bit. Just don't go overboard on the makeup. Also hair down is way more attractive (at least in my opinion) than hair up.
wouldn't sexy be more of attitude than what they are wearing? If someone is confident enough, it wouldn't matter what they wore, they'd still sweat sexy while wearing a Monkey suit in mid-summer heat! think deeper!
What makes her appear attractive and confident?
when she's comfortable with what she's wearing
if I'm wearing something I'm not comfortable in, I don't care how short or tight it is, I'm always fidgeting and too self conscious about the outfit to enjoy myself.