Stretch & Sew 130 Knit Top
This pattern fits me well, so I used it to modify a purchase sweatshirt.
I used the pattern pieces to recut the sleeve to the correct length, and to recut the bodice to fit the "new" sleeve. This left the sleeve cuff and the long sleeve seam intact. In the second picture, the sleeve is to the right, and short side seam dart tapers the bodice to the smaller armscye: