When I did my Applejack I went with right hip on my jeans made out of felt. I also happened to have a peachy-orange checkered shirt which matched her tone pretty well. So it all tied together quite nicely.
San- Princess Mononoke
Student- Battle Royale
Harley Quinn- Batman (my own variation)
Rogue- X-Men (X-Men Legacy costume)
TARDIS dress (not exactly cosplay, but still a project)