Cosplayer is Charlette Kilby http://www.modelmayhem.com/2244809
Rest of the set: http://imgur.com/gallery/v9Ji9
Imgur comments: http://imgur.com/gallery/tFci8BX
Stashed in: G4!, Cosplay!
Charlette Kilby has also cosplayed Catwoman.
We see a lot of Velma cosplay on Reddit and Imgur but not a lot of Daphne cosplay.
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