Simplicity 7780 Boys' Vest, Shirt and Jeans: Top-stitched jeans with fly front zipper have side and back pockets, back yoke waistband and carriers. Top-stitched shirt with band button or snap closing has yoke, shirt type collar and long set-in sleeves with button or snap fastened cuffs. V. 1 has contrasting yoke. Lined vest V. 2 has button closing, yoke, pockets and top-stitching.