I recommend http://www.thedentedhelmet.com/f20/bargain-flightsuit-run-43422/ I got an ROTJ flightsuit from Arkady here and he ships fast, prices fair, and keeps up good communications. Unfortunately, last update I saw on the thread, he's been in short supply for ROTJ stuff (though he said he'd be looking into getting more materials).
Although, if you're in need of an ESB suit I believe he still has necessary materials for that!
I modified this jumpsuit and it worked great but you'll have to get matching fabric for the thigh pockets, shin pockets, hanging pouches, and long sleeves. It also does not fade since it is a colorfast poly blend. But it's cheap and can be made to look very nice if properly tailored.