Sexy chick is relative, can be of comeliness of the body, appearance or attitude and personality. Sometimes, it is generally most sexy chick is measured by physical factors, (sorry) like big hips, large breasts and plump, lip fissure, height and weight proportionate and how to dress. Yes, especially from the way they dress, generally also from women (girls) also feel sexy while using minimal clothing (hot), by showing thighs, breasts peeking out behind the tight shirts and the like. Of course this is back in their respective perceptions in defining what is sexy and sexiness.
This above is just a general opinion and not the absolute opinion of everyone. Because there are many who think that it is a sexy girl who could keep her private parts, sections of the mind and morals.