Unfortunately, Orex will not replace your reusables because it won't keep out Tritium. The salesman is probably under the impression that you use the same cotton outer coveralls that we do. They would make a good replacement for the tyvek suits. BUT I caution you that they will never take the place of the Browns because perspiration degrades them rapidly. If you tried to wear Orex under a plastic suit, you'd end up with nothing left but the zipper. They make Orex scrubs too. These tear easily, dissolve with the slightest bit of sweat, hold in body heat, and cannot be worn for any kind of Hot (spark or flame producing) Work. Most people don't have this problem, but they give me a mild skin rash.
When I last worked at OPG, they were experimenting with cotton scrubs to replace the browns. They were even letting the users wear them into Zone 1. I don't know how far the experiment went, but remember that the Orex scrubs won't work inside plastic.