The Shoulder Shell from the original Charles James pattern is adapted to the Sarah dress form. This add-on is constructed from muslin fused with a stiff interfacing. The fabric of this shell is squared in a 2-inch grid. The cavity betweenthe form and the shell is stuffed with fiberfill to expand and hold the shape. A bias binding is sewn on to the neckline and bottom edge of the shell. The armhole template is constructed witha stiff cardboard between two layers ofthe prepared muslin and then inset withhand stitching. An invisible zipper is inserted upside down in the center back seam, starting 2 inches down from the top center back neck. The zippered center back seam,
which is not completely open, makes it easier to put the shell on and to take it off.