Well, I admit I haven't bought any clothes for a while either, especially since I've learned to make my own in Blender. But Blender was free and it also has a cloth simulator, Although I don't know if you can import other meshes and clotherize them. It'd be interesting to find out.

The thing I like most about MD though is how easily it does things that I struggle with in Blender, like doing gathers, and pleats, and details like that.