John Mollo, Academy Award winning costume designer, is interviewed by Lightsabre.co.uk. He says this about his work on Star Wars.
“I fins I am very self-critical when I see my work on the screen. In Star Wars I was quite pleased with the officers, guards, pilots, ground crew etc, both Imperial and rebels, for which we had no input from the States, especially with the Imperial officers. In Empire I thought the Snowtroopers worked pretty well.”
Yeah, they worked pretty well.
Source: The Lightsabre Interview.