Some times they do get paid in clothing, it happens in my local city too and in bigger cities they do test shoots providing their own clothing. There is a seperare thread, the Marc Jacobs one which talks about how models get paid in trade even for campaigns- absolutely shocking I know!
When I used the stripe dress photos I was wondering if they were the model's own and she used them in pictures were it wasn't necessary to wear clothing by a stylist.
Or if the model got them from an editorial and wore them in the next photo to promote something that didn't require styling again but the modelling being herself.