No clothes... Joking...
But seriously it depends on what the girl's body type is and what she is comfortable with. Say in my opinion cleavage is hot, but if the girl showing it with a v-neck isn't comfortable with showing cleavage or what she is wearing then that shows as unattractive form of inconfidentence.
One thing to avoid is too many layers of clothing, that's not attractive because it gives a false appearance to somebody trying to check you out and it could be potentially harmful if you live in a hot area.
One thing I like is when a girl has her own look, not trying to fit in but rather stand out and is confortable with that. That is VERY attractive and is something that will get a guy to look over at you and consider coming over to talk.
And for shoes, don't wear heals of your already really tall, not many guys like to feel shadowed by girls.