Wear plain white sweatpants and a white hoodie shirt, or black leotards and black sweatshirt. Attach multiple cottonballs to the shirt with a hot glue gun (not while you’re wearing it, of course). Wear black socks/black shoes and black mittens. Super easy Sheep/lamb Costume
Photo by Dani Steele
If you want to do this in a really short period of time, you can spray the shirt with multi-purpose spray adhesive and than dump a large bag of cotton balls on the shirt. Let dry a few minutes, repeat.