About both Cantarelli and Brioni, but mainly the latter. I'm not sure whether Cantarelli produces some fused products, but I know that the Golden Fleece they produce have no fusing. And I'm quite certain Brioni uses no fusing -- head up to Neiman Marcus in Boston for a first hand look (they have a sweet basted Brioni coat on a tailor's form -- you can see the canvassing and their incredible pad stitching).
How do you know for sure? You can't tell by just looking, and a "pinch test" will tell you nothing. By fusing, I'm not talking about the chest. Brioni, RL, Cantarelli, etc... have no fusing in the chest, they are fully canvassed in the chest. Thus will qualify as a "canvassed suit." Brioni, RLPL, Oxxford, Kiton are hand canvassed, lesser priced ones are machine canvassed. All manufacturers use *some* degree of fusing (Kiton is entirely hand made). However, on Brioni or Cantarelli, it's so insignificant that it doesn't really matter, and in places that you couldn't even tell. On Cantarelli, RL, Zegna, etc... (suits priced from $1K to $2K), moderate fusing is used in the collar, and mostly in areas below the bottom button of the coat. Thus I said "some fusing." Again, it is pretty insignificant. If I didn't tell you this, you wouldn't even know. If you had a better trained eye, you could tell in areas below the first button. BB Golden Fleece, while a very high quality suit, isn't entirely hand made. They would literally loose money for retailing a suit at that price if it was 100% hand made/hand stitched. To clear things up, Brioni uses an absurd amount of handwork. I haven't seen it talked about accurately on this board, as to what it is in real life. The amount of hours that go into each coat, are the highest in the industry, next to Kiton. However, there is a bit of fusing in the collar; which doesn't make a difference.