S.G.
One year my brother went as "traffic". He had a long sleeve black shirt and black pants we got at Goodwill. We put yellow duct tape as a dotted line from his neck down one side of his pants. We hot glued matchbox cars going in opposite directions along each leg and his chest. We used circular stickers in red,yellow,green that you get for garage sale pricing as stoplights along the way. You could cut things out of felt, too. The tape is sold at Home Depot and hardware stores, and it even comes in glow-in-the-dark. The costume was a hit with the other kids!