I personally order a lot of my clothes from the UK/Europe. verified stores on ebay & Amazon are great too.
the US doesn't carry my favorite brands, or rather, there's a much wider variety of shit I like in the UK
G-Star - the countries in Europe each have a different seasonal lineup of clothing not available in the US
Scotch & Soda - more options available than the US
Jack & Jones - none available in the US whatsoever, they don't even ship to the US (rage).
Religion - more options available than the US.
a few more.
verified Amazon & ebay stores are great because the clothes are brand new & generally cheaper than retail. if there is only a handful of items left in stock, the prices are usually always cut in half just to get rid of them.
Guess is also pretty cheap, their website always has sales.