Only two stitches are utilized in this pattern: slip stitch and relief stitch which is a double-crochet stitch just executed one row lower than usual. The set-in sleeve opening makes my pattern NOT easy. However, it is a good start to learn this new technique if you are looking for a good fit in your crochet project.

Correction for Arm opening (back)

Row 8: as Row 7.
Repeat last 2 rows four more times.
15 sts are decreased from each side.

Continue in stitch pattern with 84 sts before shoulder; (46 rows)

Correction for Front:
Follow the same steps as for BACK before armpits; follow the same steps to shape arm-openings.