I spent ages looking for a real uniform about 18 months back and they just aren't available. Mainly due to the security issue as staff have to return old uniform and if they sell stuff they are liable to be sacked.
Also many aren't actually that sexy as mentioned above.
In the end we bought one of the darker blue play suits and took it to a local tailor who lined the skirt & jacket for about the same price of the original costume. He also replaced the skirt zip and fastner for something more robust!
This we teamed with a white blouse and a scarf that we found on the net. Finally I found a 'pill box' hat, like the old stewardess's used to wear, in a blue that matched the uniform.
It's so good that my OH has even worn it to fancy dress parties, much to the suggestive comments of the other guests :)