Simplicity 4107; ©1952; Men's Jacket and Vest. Father and Son Fashion (For Son see Simplicity 4134) The vest features four welt pockets in front, and a belt stitched in side seams buckled in back. Contrast back of vest is optional. The jacket has a notched collar and patch pockets, one at each side at lowe edge and one on upper left side. The center back seam features a vent opening at lower edge.