Difficulty 5/10 (It got complicated when I did the buttons because I didn't plan ahead. Should have been a 3/10, it's very easy to make. I re-used the hole for the head and all the cuffs - the baby was exactly as long as the sweater from shoulder to ancle. ) No pattern, just improvisation.
The baby jacket was sewn from a 60's fabric that my mom had kept. The lining, however, used to be a T-shirt from a market in Thailand. I gave to my brother who hated it and gave it back. Now it's finally found it's true purpose in life. Difficulty 7/10, result 10/10.