For skirts, try to wear ones with lots of drapes and such. Pleats can also add a similar effect, and can add a school-girlish look which will be perfect in about a month!
Jeans with big pockets are also a much if you are wanting to add a some curves in the back! Miss Me jeans are notorious for giving that effect, but they also happen to cost a lot! Just shop around a little until you find some you like... it is hard to say exactly where you will find the perfect pair!
*all pictures are from Forever 21, except for the jeans. The jeans are Miss Me jeans that I was using as an example of the types of pockets I was talking about.
Any requests for posts? Leave them in the comments, because I love doing posts that you actually WANT to read! :)