Hi This suggestion is about the Demo version my suggestion is that the export button is available for the demo version but there's a limited amout of costumes or skirts or whatever you call it in the demo version but you can export(This is just a suggestion and its not any hate against this Amazing software)
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Hello there! There's actually some plans for that as we're approaching a more mature version of the app. In the next release, demo will be changed to 'Free', with the paid option changed to 'Pro'. Free users will be able to export PNG files, whereas Pro users will be able to export to all currently available format options (PSD and SVG for now), and use downloaded content.
Thank you very much for your suggestion and interest!