Ladies what exercises will help me look better in skinny jeans?

Ok I'm 15 and I'm trying to look better in skinny jeans. I'm already pretty skinny and from my ankle to my knee is fine but my thighs could use some work maybe even my butt. What works out can get ride of some flab and giggle without making it look really muscular and thick so it just look nice slender and skinny? Also trying for a femine look any advise in work outs and or outfits for the thighs and booty swag? All advise is appreciated thanks(: