Head to the party donning the Adult Muscle Chest Robin Costume and you'll be the coolest sidekick in attendance If you're a huge fan of this trusty Gotham City sidekick, then you certainly don't want to miss out on this powerful DC Comics outfit. Featuring a muscle padded red Robin top, a bright yellow top, and a black eye mask, you and Batman will be ruling all of Gotham this year when you're donning this great set.