The smallest size would probably be suitable for a 10-12 year old child.

Measurements
(Four sizes)
To fit bust or chest sizes
71/76, 81/86, 91/96, 101/106 cm
(28/30, 32/34, 36/38, 40/42 in)
Finished measurement
81, 91, 101, 111 cm
(32, 36, 40, 44 in)
Length to centre back neck
59, 62, 66, 69 cm (23, 24½, 26, 27 in)
Sleeve seam
43, 44, 47, 48 cm (17, 17½, 18½, 19 in)

Each booklet has its own recommended yarn. Those that follow are from the Woolworth and Knitwell booklets. Woolworth suggest a specific yarn, which is not in the database.

Materials
(Woolworth) Winfield 500 Aran Knitting
750, 850, 950, 1050 grams
(Knitwell) Knitwell Aran Knittings
17, 19, 22, 24 balls (probably 50 gram balls)
Cable needle
Open-ended zip fastener.