Duo Halloween Costume: Khadijah and Synclaire From "Living Single" For another '90s-themed option, look to Khadijah and Synclaire from "Living Single" for your duo Halloween costume inspiration. Fun patterns and bright colours are welcome. What to wear for Khadijah: A colourful '90s-inspired top, biker shorts, and long socks with trainers. What to wear for Synclaire: A button-up tank top, long shorts, and a headband. Image Source: Everett Collection