The Book says, “A shirt sleeve is sewn into a dropped shoulder armhole…there is very little curve in the sleeve cap and also very little ease-stitching required in the sleeve cap when attaching the sleeve to the garment.”
And therein lies the main problem with what you’re about to see. I used a regular set-in sleeve pattern for this, so things get…wonky. Read the words, laugh at the pictures. I obviously need to practice sleeves a bit more.
For a shirt sleeve, you want only the shoulder and yoke seams of the main garment done (no side seams) and the sleeve itself needs to be unfinished, as well (unless you’re doing a placket opening at the cuff, then get that done first)
You need to ease or crimp the sleeve piece. I went over crimping with Set-In Sleeves, so let’s do some easing here.
Baste stitch on either side of the stitch line from one end of sleeve cap to the other
Pull threads to gather enough to fit arm hole opening.
So, now, place your sleeve, right sides together, on the armhole. Match all notches, the shoulder position, and underarm seams. Pin pin pin.
Now sew from end of sleeve cap to the other end.
Remove basting stitches from when you did the easing
and oh, dear! is it supposed to look like that? No, but let’s pretend so we can move on. You can top stitch at this point. I couldn’t see a need seeing as how it already looked so amazing
Then just finish the rest of the garment by matching the underarm seam of the sleeve to the side seam of the garment
And hopefully yours won’t look anywhere near as bunchy as this. I rock.