The U.S. Civil War Junior Officer's Uniform Single Breasted Shell Jacket (Shelljacket) has the front buttons spaced per regulations. It is made of dark blue wool and lined with black cotton. The collar and cuffs are made of the same material as the coat. The coat comes with an inside left breast pocket. It has functional cuffs, with three button closure. It is identical to the Junior Officer's Frockcoat except the jacket has no skirt.