Quite a few labels are making knit Blazers these days. Looks for these labels: Harris Wharf and Barena. If you want something more elevated, I recommend Lanvin. Barneys and Bergdorf would be good places to go for these.
Kilgour used to offer an "entry level" bespoke option, where the cloth was apparently cut in England, but the suit was assembled and finished by their partner in Shanghai. This program was discontinued in the late 2000s, I believe.