In the episode were Drake and Josh have to deliver their Aunt Catherine's wedding cake, Audrey asks Megan to zip up her zipper,when she did you could hear it zipping, but when you saw her back when she went to get the door you can see there is no zipper.
Most of the time zippers on dresses are hidden once zipped. Where the zipper is could simply look like a seam once zipped, Which is most likely the situation here.
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