I can’t seem to export the SK_SkirtMiniA, SK_SkirtMiniB, SK_HippieDressA or SK_HippieDressB, is there something im missing in exporting these? I was going to try using the SK_HippieDressB model to try and model a longer dress (ankle length) but try as I might i just can’t get it or the other three to export, Any help would be appreciated 
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The attached picture basically shows kinda what i am aiming for, but im not every good at modeling clothing: