Eeeee that'll be awesome. I love the Wallflower.
I would cosplay it but I have too many cosplays already... heh heh... I'd do Sunako in just her school outfit +bangs.... I know how to walk with hair right in my face so it wouldn't be a problem for me. Ehheheheh
Anyways, Thrift stores. Just any around town. Keep looking whenever they restock. If not, ebay probably has the items.