Butterick 3721; ©1986; Ruth Scharf - Children's Jumper, Jumpsuit & Top. Jumper, above mid-knee or jumpsuit has button shoulder straps, lined bib with optional applique and elasticized back. Jumper: A-line skirt. Jumpsuit: elastic at lower edge. Semi-fitted, pullover top has back neck slit with button/loop and above elbow or long sleeves with elastic. Narrow hem. A: contrast.