I'm not sure that flat lining would work with those drapes. Would it work if you flat-lined the bodice and made a loose lining for the skirt but just gathered at the waist and not shaped and draped as the top payer will be?
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There isn't really a waist- those ties go through a couple of pleated sections with a buttonhole, the dress itself is just two pieces, front and back. I'm currently deciding between cap or smallish flutter sleeves...and looking for a simple free pattern or drafting instructions lol cba doing anything more complicated!