Anyone have any ideas what is happening here?

I have a skirt and a dress.

I drape the skirt first, and it drapes fine. But when I drape the dress. I get this

I haven't added any constraints. If I have it so that it does not collide with the skirt, it drapes fine. I've tried changing the skirt to rigid or soft dynamic in the dress simulation, but that messes up the skirt simulation. Any suggestions? 

ps I know the sleeves and bust need work. I'll get to those later once I have this figured out.

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