Casual Goth is, if I might make so bold, a fashion subset that all of us dabble with from necessity at one time or another - some of us when just starting out in the Goth scene, some due to school, college or lifestyle, and some simply from preference.
Brand name pieces can be useful for a casual look on those days when you've just rolled out of bed and need to get going pronto, but beware - too many brand pieces together tends to be obvious and creates an image more mallgoth than casual. Brands which do a handy-dandy selection of casual streetwear include Spiral, Criminal Damage (nowadays more scene/emo style than Goth, but they still have some nice pieces), Hell Bunny, XS Punk and Living Dead Souls. But just to reiterate, I would advise mixing-and-matching with thrift store or army surplus pieces to show that you didn't just buy an Insta-Goth Kit. (This also means less stress on your wallet!)
Industrial Records, has been 'officially re-activated' and has re-released TG's entire back catalogue.
P.S. No, I haven't forgotten about the upcoming closet culling, if I may pinch a phrase from Gothic Charm School. I'm just waiting to get a decent camera and work out some sensible postage charges for overseas. Current goodies include a velvet blazer, a Cyberdog tank top, and a pleated tartan mini. ;-)