This is a top-down sweater that is knitted starting from the neckline.
Using circular needles, both the body and the sleeves are worked in the round.
The sweater begins with a provisional cast-on.
Except for the ribbing at the neckline, sleeves, and hem, the entire piece is worked in stockinette stitch.
Short rows at the neckline are worked using the German short row method.
This pattern is also recommended for those trying a top-down sweater for the first time.
Yarnyvore for proofreading (maesaid@gmail.com)

首から編み始めるトップダウンのセーターです。
輪針を使って、身頃も袖も輪に編みます。
あとでほどける作り目をして編み始めます。
首、袖、裾のリブ編み以外は全て表編みです。
首の編み進む引き返し編みは、ドイツ式引き返し編みを使っています。
初めてトップダウンに挑戦する方にもお勧めです。