I think it went that Rarity made the Gala dresses for the other five. They saw them, but they weren't really what they had in mind. So Rarity, using the MANY suggestions of her friends made new..."dresses". They displayed them at a fashion show...and the ponies, including Hoity Toity, one of the top names in Equestria Fashion, said they were quite ugly. So the five ponies went back to the dresses Rarity had made before.