Yea I heard the snowing was really bad everywhere this year
Well most people seem aware of cosplay, so I actually don't think it would be that weird :P I saw a One Piece photoshoot going down while I was playing beach volleyball at a summer camp
And when I am on the MRT I have heard some rude people comment none-too-quietly to each other "她在玩COS嗎?"
I don't think your costume is ultra-stand-out-y anyway
You probably don't have much to worry about!