Vintage Butterick Classics Kids 5396 Toddler Pant Shorts Jumper Romper 1 2 3 

Very easy!

Toddlers'/ Children's Jumper, Jumpsuit & Top

Jumpers, above mid-knee or jumpsuit has front button shoulder straps, low armholes, pocket, side front pockets, partially elastic back and back pockets. B above mid-knee A,B C narrow hem. C longer than full-length, rolled-up (wrong side shows) D leg bands. Optional snap crotch closing. Loose-fitting, pullover top has mock bands, snap shoulder closing, dropped shoulders and above elbow sleeves with stitched hems or long sleeves, narrow hems.