The pattern is written in French

A long cardigan in a ribbed stitch with wide ribbed collar and optional belt.
Le gilet 3/4 à ceinturer tricoté dans un point façon damier maxi col et boutons en contraste

Additional gauge notes: 17 sts to 10 cm and 47 rows to 20 cm measured over pattern (stretched to simulate weight) using 5mm (US 8) needles.