Still looking for the perfect Halloween outfit? Why not be a little monster like Harley Quinn? The Harley costume inspired by Margot Robbie in the new Suicide Squad, is going to be the hottest outfit this year. So we did a little research for you and came up with a list of places you can find similar shirts – plus we threw in a few more variants just because they were cool. Check out the list after the break – happy haunting!