The robin costume was based primarily on the 60's TV show robin. I found some fairly inexpensive spandexish material which ended up being a b*tch to work with on a sewing machine but I finally figured it out. I Also made the utility belt fully functional so he could keep his wallet I.D. etc on hand.
The Batgirl costume was more of an amalgamation of things. It was built primarily out of PVC and left over spandex from the Robin costume. Her utility belt came with all the same entrapment's.
Here is a picture of the costume in action! (fits alot better on him then on me).