There is a fastener joining the front at the neck. The front and back are buttoned together at the bottom of the garment, between the legs.

Measurements
To fit chest 16, 18, 20 inches
Actual measurements 18, 20, 22 inches
Length from back neck 9½, 10½, 11 inches
Sleeve seam 4½, 5, 5½ inches

Each pamphlet has a different set of recommended yarns. The following are from the Midgley and Catton version.

Materials for Complete Set (Rompsuit, Coat and Bonnet)
4 Plys
Homestead with Nylon, Playtime Crepe and
Mascot Nylon
7, 8, 9 balls
Stitch holders
4 buttons
6 inch fastener.