Now that is pretty cool. I like how you incorporated her bodice into the overall outfit. The half jackets' nice if a bit clunky. I know it would bug me if I had to keep pushing up those sleeves, so maybe a quarter sleeve for the jacket?
Straps would work,probably come out from inside the sleeve and have a button snap on the outside to connect to. I have a pair of capris like that that are pretty nifty and a friend of mind did that to her steampunk jacket.