Do you mean can girls tell if other girls are attractive? Haha, yeah we can ^_^
Or do you mean, why do hot girls hang out together? Um, for one thing birds of a feather flock together... Girls tend to hang out with other girls who have similar interests and a lot of the time they will have similar styles to go with that. Another thing,girls are naturally very competitve creatures and because of this there is a lot of jealousy circulating. Girls don't like to be upstaged generally so, a lot of the time they hang out with girls of the same caliber of attractiveness or lower... Basically, in SOME cases NOT ALL the "hot" girls will chill together because less pretty girls are threatened by them and such. This all sounds so shallow. I kind of regret this answer but there's my two cents...
Well, I think girls think a wider of variety of girls are pretty. Like guys may think this one girl is ugly but every girl you ask they think she's beautiful, but we or I know which girls guys would think are attractive and which girls would be more average to them. It's like the way they dress and look. I don't even think this made any sense. ha ha but I know what I'm getting at.
Symmetrical face, the golden ratio and features that are familiar. Plain looking faces are often deemed as most attractive. And for a girl, feminine features (big eyes, full lips). I'm talking purely about faces here.
But I think it's often because people tend to choose friends that are of similar attractiveness.
lol this is one of the most funny questuins I've ever seen this is obv a girl askn the question but anyway ill entertain this question, k well big boobs, not to large but not to small very nice shaped ass, nothing big nothing to small, slim arms nothing descusting like small or fat, aka no flab fat, very clean non gresey hair, guys can tell, and they dress good, me personaly I don't like the slutty getup but nothing to fully covering