Look! Look! The sleeves are in! And they are both set in as perfectly as I've ever set in a sleeve! No accidental pleats or unintentional gathers. Woot!
Since a few people mentioned that they had never heard of leather tape before, I thought I'd provide a bit more info. I bought on line at Wawak (click here). It comes in a 60 yard roll in two different widths - 1/2" and 1/4". Here's the description from the website:
High performance high tack double sided seam tape for leather and vinyl hemming. Allows for superior bonding and conformability to irregular as well as flat surfaces such as plastics, metal profile extrusions, decorative trim, and is also used as a universal all purpose double coated tape.That's it. It's just really sticky double sided tape that you can use to glue down seam allowances. Peel from the roll, stick the sticky side down, peel off the backing on the other side and smoosh down the seam.
Next step: shell + lining = finished jacket.