Such a cute idea to do for their very first dance recital and you can keep for years! Or baseball Uniform for the boys :) oh my gosh. I would hang up MY first dance costume in the nursery if I have a daughter. How sweet.
Take popsicle sticks (here they used paint sticks) and paint them the color of every wall in your house. Carry with you on the go to match furniture, curtains, decorations, etc. (I'd add paint color/manufacturer info on back of stick too.