The problem here is that the costume has been drawn onto the canvas rather than the template. It's split into two pieces (top, bottom) but it actually needs to be split into six or more: chest, back, right thigh, underboob, leftBreast, rightBreast, etc. Each of these pieces must then be given a name which corresponds to one of "magic words" recognized by the SDT template system. No such words are currently included in the FLA file, so nothing appear when the SWF is loaded in-game.
I can chop it up and rearrange the pieces into separate symbols with appropriate names and anatomical reference layers. I'm in the middle of something at the moment, but l should be able to post a revised version in a few hours.
The one big question mark is breast size. If you're happy with the current breast size then we can proceed as-is. If you want breast slider support then we'll need to do some additional work. We can also add RGB slider support, but that's a straightforward operation which doesn't involve any fancy re-design stuff.
We might need to shrink the side-slit of the dress slightly, because a slit which is both high and wide can create problems during animation. I'll let you know.