I definitely think you should try to focus more of an aristocratic lolita style because aristo's are very similar to steampunk *without all of the watches, gears, etc...* You'd just have to add those elements. With the print, I don't think it really gives off that Steampunkish look. Just don't try to make it a certain thing. Do whatever you'd like with it to make it look like one outfit. If you try to hard to make it steampunk I don't think it would look right with the print on the corset. You are using that as the base of your outfit, so I would go from that.
Either way, this is just my opinion, but I think it would look best with an aristo loli look to it.
Have fun with it. ♥