Not being a fashion fan - I don't know if a dress design can be copied or not. I asume this like what supermarkets do when something becomes popular.

As for the issue of some folks being overboard on this - yes the majority of us don't need to worry. But for some artists here, stuff like this important. If you rendered a piece for a magazine and theres any issues over trademark, copyright or whatever you may not get paid.  

Pinky - you left the lens cap of your mind on again.