I typically buy my clothes from Forever21 or some local "boutique" type stores. I say "boutique" because the are clothes that are typically in style but dont cost an arm and a leg. I never pay more than $30 for a shirt and I am always looking for a bargin.
Pants: Goody's (I miss that store, they always had bargins)
Shirt: Polish (local store)
Pants: Ann Taylor Loft
Pants: White House/ Black Market