Frame can be found here

while the neck edge is worked in rib which is continued down along the front edges

which in the given example would give you 10 cm [4 inches] of positive ease

M1Lk on the RS:

width: 4 mm

Knapper af galalit med 2 huller Ø25 mm - Mørkebrun - 6 stk. shopper Frame can be found hereImitated horn buttons in galalith in packs of 6 pcs suitable for Novice Cardigan Chunky Edition and Sunday Cardigan Junior Measurements: Diametre 25 mm Material: 100% galalith. Galalith is a natural and biodegradable material made from the milk protein casein. The buttons can be washed in the washing machine. Produced in the Netherlands. Galalith is a natural material which can shrink during the production of the buttons. The measurements are