Who wears a red and white polka dot dress and has big round black ears? Why, Minnie Mouse, of course. A Minnie Mouse Halloween costume can provide so much fun each year. The costume is instantly recognizable and brings a smile to everyone’s face. Find infant, toddler, child and adult Minnie Mouse Halloween costumes online.A good place to get a discount Minnie Mouse costume is at eBay. Some sellers offer free shipping. Here are some of today’s eBay listings for a Minnie Mouse Halloween costume: These days it seems any female character is also available as a sexy Halloween costume, and Minnie Mouse has not been spared.