Sebastian Cosplay

Okay,first I have to say how much I love TheO for having Kuroshitsuji under Kuroshitsuji and not Black Butler. Now, so my cosplay group and I decided to do Kuroshitsuji for Friday of Connecticon and I'm Sebastien!!!! Thing is, I can't afford a Sebastian cosplay XD. So, here is my brilliant idea and please comment if you think it's terrible or if you have another brilliant idea (also comment if you think it is the best thing you've ever heard and it's gonna help with your Sebby cosplay). So, I'm going to go to Goodwill or Salivation Army or another store like that and get a black dress coat (not a heavy wool one but a light one) and cut it to look like a tail coat. and for the vest I'm just gonna hope I get lucky and find one XD