So I managed to snag a really excellent alt to Clara's Roadmaster Belstaff jacket off of ebay, and I thought I'd post some pictures! I'm really happy with it, and I'd definitely recommend grabbing it if you see one.
It's by Guess, and was listed under "Guess Motorcycle Utility Jacket," so I'd recommend tracking similar tags if you're looking for an alt.
Some details about the jacket: it's a cotton/nylon with silver hardware that I'm considering recoloring to match the jacket, and it has leather accents on the pockets and the buckle strap on the collar.
Front w/ SA dress:
Back w/ SA dress:
Close up of front: