Well there is a list of layers that are used in the system so you can have a cape section behind the body and one in front of the body. Tops are probably the most complicated because of the arm behind, the chest and the arm in front. Also bottoms behind shoes (pants) or in front of shoes (skirts). They're just sectioned into larger groups so we can only wear one of those categories at once.
ShiroGEM rolled 3d6 and got a total of 15:
6, 3, 6