You may need a circular needle for button band finishing, if desired.

Girls cardigan (with pocket) needs 5(5, 5, 6, 6, 6) buttons
Boys cardigan needs 4(4, 4, 5, 5, 5) buttons

Finished measurements:
Chest circumference: 23.75(25.5, 28, 29.5, 31.5, 33.5)“ 60(65, 71, 75, 80, 85) cm
Finished length (girl’s version) - 19(20.5, 22, 23.75, 25.25, 26)” 48(52, 56, 6 ,64, 66) cm
Finished length (boy’s version) - 15(16.5, 18, 19.75, 21.25, 22)“ 38(42, 46, 50, 54, 56) cm
Sleeve to underarm - 9.5(11.5, 13, 14.5, 16, 16.5)” 24(29, 33, 37, 41, 42) cm

Yarn used:
James C. Brett Driftwood DK
Girl’s Cardigan - Shade DW 05 2(3, 3, 4, 4, 4) balls
Boys Cardigan - Shade DW 04 - 2(2, 3, 3, 4, 4) balls