You will need: 1 pair 3¼ mm (UK 10 – USA 3) knitting needles and 1 pair 2¾ mm (UK 12 – USA 2) knitting needles. 7 buttons for Standard Length Cardigan and 5 buttons for Cropped Cardigan.
Errata
Sleeves 11th row. (Inc in first st) 0[0:1:1:1] times, k18[19:19:21:22], *(yfwd, s1, k1, psso) twice, (k2tog, yfwd) twice,* k3, rep from * to * once, k18[19:18:20:21], (inc in next st, k1) 0[0:1:1:1] times. 55[57:61:65:67] sts.