Wear bootleg jeans. They will always flatter you. Skinny jeans, may not look that good if your already really skinny. Maybe they would, depends. Just done get super skinny ones. Flares, wouldnt look good either, because they would look baggy, so bootleg is the way to go, since there not skinny or to wide.
Shorts, look great on tallish/skinny girls. Shorts and a polo shirt, looks GREAT!
Maybe a pair of white shorts, and a blue polo? That would be really cute. But I guess its getting cold out side, so you couldnt really wear shorts.
Skinny girls look great in anything. They can wear skimpy tops, without looking bad in them, because it doesent look slutty, and there not too big to be able to pull it off.
Go for V-neck tees, babydoll tops, flowy tops, anything cute really.
Maybe you could wear a pair of light jeans, a flowy top, and some flats or something?
Sweaters are great too.
Just look at places like A&F, Hollister, Wet Seal, AE, Forever 21, Charlotte Reuss, where ever, and look for things you like.