I love knitting these. The principle is similar to my EZ socks:
dec from shoulder to armpit for half the front,
inc for half the back,
bo while attaching the sleeve (leave room for the neck),
co to make it a full L again, and repeat the above for the other side.
It may sound complicated, but it’s just fun. It’s like 4 L pieces attached together to make the sweater.
A variation with short rows for shaping the sleeves:
I love how they fit:
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