Last I checked, we're not supposed to sell uniform items on ebay or any other online shopping site...
Personally, I'd buy the uniforms new and then get them tailored. You'll get alot of mile out of the items, as I've got some uniform items I've had for about 10 years that I'm just now having to replace. Mostly, its because I'm a different shape than I was a few years ago. Only twice have I had to replace a uniform part because it became unserviceable.
I'm assuming you're a new commission, based on your profile. If you don't have a wife or kid, you can afford to pony up for a good set of uniforms.