Oh good, mango linked the thread so I don't have to repeat myself.
But basically, unless the masquerade director has specifically decided that THEIR masquerade is about "character portrayal" and who can look or act the most like a canon character, and tells you that, then nope. Nope nope nope. All costumes are fair game because accuracy is not the only thing that people are judged on. Not by a long shot.
Founder and Vice-President, Madison Area Costuming Society, a chapter of the International Costumer's Guild
Strange Land Costuming - www.strangelandcostumes.com