Sully Disney Deluxe Adult Costume Disney Monsters Inc. Mike Sully Cozy Sherpa Zip Up Cosplay Coverall The Ultimate Sully Costume : 7 Steps (with Pictures) Instructables The Ultimate Sully Costume : 7 Steps (with Pictures) Instructables Sully Costume Etsy. The Sully Playsuit in Faded Denim is a refined yet relaxed one piece crafted from soft GOTS certified organic cotton. Designed with a classic polo style collar and subtle button detailing, this timeless silhouette blends everyday comfort with a polished European feel. The washed denim blue tone gives it a casual elegance perfect for warm weather outings, family gatherings, or summer travel. A versatile standalone piece that also complements the Marlo Polo Shirt and Kalle Shorts for coordinated sibling styling.