The wig is from Rock Star Wigs and was repurposed, as I used to use it for my Silk cosplay. He was wearing a kilt and sinister laughing clown face mask as part of a Cosplay outfit – short for costume play. What sets cosplay apart from typical fancy dress is that cosplayers usually invest a lot of time making their costumes themselves, and the outfits are usually worn for a specific event or competition.