The Gryffindor robe was purchased at a costume shop. It's actually a child's size large.

http://shop.halloweenadventure.com/shared/StoreFront/default.asp?CS=masquerade&StoreType=BtoC&Count1=4848659&Count2=921989083&ProductID=13368&Target=products.asp

I wear a wig for this costume; it was originally very long (down to my waist) so I cut it using professional hair cutting scissors. All photos were taken by my husband.