Yes and no. Clearance section can go as high as 50-60% off but sizes are very limited. I will say tho that Red Fleece stuff are always discounted heavily on clearance since they're not hugely popular line for BB. I think partly due to everything RF are extra-slim fit / milano fit with the jackets/shirts and pants.
Black fleece are better quality than regular BB but they're pretty overpriced IMO. 40% off BF is not rare occurrence. I bought a BF linen shirt for 60% off clearance as well.