That was quick!
I did do the design in MD and rigged in Blender. But it's my first serious try at uploading stuff, so I'm a proper noob when it comes to mesh. I am not sure about the first isue I mentioned. The modeling in MD and the rigging in Blender is both done in a t-pose, so that should work right? ( I imported an sl model into MD)
So for the rigging I clicked the dress, then the skeleton and set to parent with automatic weights. Maybe that's the issue? The skirt looks fine, it's just the top that's all crazy.
In any case thanks a lot for taking the time to reply, I appreciate it!