Amy's clothes are usually just things you find at the store. I don't think you need to commission it. It would probably be cheaper, and more fun for you, to go retail hunting. Try thrift stores and big box discount stores. It's just a red V-neck shirt, shorts, and a blue coat iirc. Amy's signature look was the shorts/miniskirt and boots.
Costume Con - Kili in a dress
Atomic Lollipop - Come visit me at the Make-Your-Own-Button free craft booth!
Polar Chill - check out my costume DIY panel and workshop
FanExpo - Iron Man Mark VII version 2, Pacific Rim Jaeger pilot?
FanExpo - fem!Iron Man Mark VII - The Iron Man Armor Project
Atomic Lollipop - Vanellope von Schweetz; raver!Sailor Mars