Hey! I looked a while ago and found nothing. I checked again just now and the closest I found is this: http://www.etsy.com/listing/105285820/harry-potter-dumbledores-army-nerdy-t
I think the one Evanna is wearing used to be available from wbshop.com but is no longer being sold :(
If you have any Evanna fashion finds, send them in and we’ll credit you!
For everyone who has left requests in the ask, I’m working on it. Lots of the stuff is really hard to find, but I’ll let you know when I hunt them down!