OK, noticed this and thought “what fun” but am now making a mockup and I find that the instructions for the sleeve are confusing me. The sleeve is 15 x 10 inches, yet we are supposed to match to the marking 8.5″ down from the seam on the shoulder. It comes up short. And why at #7 we are asked to “stop 5/8″ from the shoulder end”? It does add to press the seam allowanceS open, so perhaps (as I mention below), we have to cut 4, not 2.
The illustration clearly shows a seam from the shoulder to cuff of sleeve, that’s not mentioned. And shouldn’t there be 4 15 x 10 sleeve pieces cut, not only two? That would allow for a seam at the shoulder and one on the underside. That would mean that the 15″ is the length and the 10 x 2 is the circumference. The photo of the flat garment has peculiarly-looking tiny sleeves which would hinder movement.
I can certainly manage to make a simple sleeve for this jacket without the directions, but if they are wrong it may save someone else some frustration. Reading this through, I think I have found the answer, we cut 4 sleeve pieces, not two. I would like some opinions on this, please.