The Well Dressed Baby Leggings by Marshall Cavendish Ltd.

The Well Dressed Baby Leggings

Knitting
Fingering (14 wpi) ?
30 stitches = 4 inches
in stockinette on size 3
US 2 - 2.75 mm
US 3 - 3.25 mm
3-6 months
English

Materials
100 grams/4 ounces of sport/fingering yarn.

Stitch by Stitch, The illustrated encyclopedia of sewing, knitting and crochet, Volume 3 also has a vest, bonnet, bootees and mittens on page 337-339.