Looks complicated but straightforward once you begin, just knit with the colour in use and slip the stitches in contrast. More hints included in pattern.

Instructions for the cord are not included the pattern but freely available online. Alternatively, use 1 m narrow ribbon.

Sizes: ages 6 months (12 months) approximately. Actual chest measurement of jacket 52(56) cm.
Materials: Jacket: James C Brett Supreme Baby 4-ply: 1(1) x 100g ball 440 m/482 yds; 1(1)x 100 g ball James C Brett Super Soft Baby 4 ply 439m/480 yds; Hat or bonnet and mitts: 1 ball each as above; pair 3¼ mm and 3¾ mm needles; 3 stitch holders; 5 small buttons for jacket, 1 button for bonnet; 1 m narrow ribbon or cord for mitts; 3 stitch holders