Having just bought a slightly oversized Gibson & Barnes Civil G-1 off the ‘bay at a great price, I decided to experiment and perform a little jacket surgery (a “Jacket-ectomy”? Lol). I opened up the inner lining and inserted a lightweight Eddie Bauer goose down jacket and then sewed the whole thing back up. The down insulation makes the jacket toasty warm and it doesn’t add too much weight or bulk; it actually makes the jacket fit much better! And now I have a “winter” G-1!