A lot of them were made by her costumer at the time, I think... Akira Noda. (Body suits and main cover one)
As for the pink dress, I think I found the origins. It's from Alexander McQueen. (Kimberley Walsh auctioned hers off as a 'black and fuchsia geometic McQueen dress') There was a similar dress in the McQ sub collection. Still CANNOT find the original though.
