This cardigan is worked from the top down and is designed to be seamless. You work the body and sleeves in one piece down to the armholes, followed by each sleeve. I found it easiest to leave the live stitches for the sleeves on a piece of waste yarn

Sample photographed in shade 205 ‘Dionysus’

Socks Yeah DK by Coopknits (112m 122 yds per 50g skein)
8 (8, 9, 10, 11, 11, 13, 14) x 50g skeins

Notions:
Six stitch markers
Stitch holders or waste yarn Darning needle
Seven 12mm buttons

Cast on (your preferred method), increasing and decreasing, picking up stitches, working in the round