This pattern is available to purchase from Ravelry

This cardigan is worked from side-to-side in one piece. The opening for each sleeve is worked with waste yarn, then “unzipped” later. The unzipped stitches for the sleeves are then picked up and the sleeves are worked seamlessly using short rows to shape the sleeve caps. The cardigan is designed to be loose-fitting and flowy with simple details and clever one-piece seamless construction.

Anne Kuo Lukito
Finished Size
Finished cross-shoulder width: 15¼ (19, 23½, 28¼)”
Fits bust circumference: 30–36 (36–44, 44–52, 52–58)” and
meant to be worn with a 2–6“ ease.
Manos del Uruguay Fino, shown in 414 Ivory Letter-opener (3 (4, 5, 6) sk)
stitch markers in 3 different colors (for sleeves)
about 10 yds of waste yarn in a contrasting color
tapestry needle
24 stitches and 38 rows = 4” over Stockinette Stitch.
Needle Size
US 4/3.5mm ndls, 40” circular and double-pointed

See more like this: