Billy Porter at the 2020 Grammys What to wear: If you want a truly iconic Halloween costume this year, look no further than this ensemble from Billy Porter. Pair a cropped blue jacket with a blue jumpsuit (or a matching top and pants), and add a large blue hat. Complete your look by topping it off with sparkles, jewels, and a small diamond-encrusted clutch. Image Source: Getty / Amy Sussman