Classic double moss stitch crew neck buttoning jacket, with modern drop shoulder (no armhole shaping). Left and right fronts are are shaped at lower edge to form a curve. Garment is simply trimmed in 2 contrast colours - 1 row double crochet and 1 row of chain stitch loops.
Patons Australia.

Size 0 months: 35 cm chest measures 41 cm
3 months: 40 cm chest measures 46 cm
6 months: 45 cm chest measures 52 cm
12 months: 50 cm chest measures 60 cm
18 months: 52.5 cm chest measures 65 cm

Scrap yarn can be used for crochet edging - 1 ball each of 2 colours is called for in the pattern.