Not so much a distinct 'fabric,' but I really like wool gabardine on tailored jackets, looks refined but the gabardine makes it feel more approachable and less formal. I also like denim a lot, since it's the stuff that covers my legs practically every day. Coincidentally, I love wearing my Y's wool gabardine jacket with a nice pair of jeans, my favorite combo.
And there was a Y's hoodie from the F/W season that just ended, when I touched it, it felt as soft as cashmere but I checked the composition and it was 50% wool, 50% acrylic. I thought that was a great use of blended fabrics.