The first is based on a dress I own from Banana Republic, with a bolero style sweater and the House badge. It is two seperate images, coming in four colors each. The second is a pair of black pinstriped pants, which are kind of uniformish, and a Hufflepuff ballcap (only in yellow so far). The third is a pair of black jeans, again kind of uniformish, and a polo shirt with the House badge on the left breast.
The faces, hair, accessories, and the yellow and black striped sweater are from other doll sites.