How about Harrison's Oyster #75712. I have a suit made from this fabric--a 14-ounce hopsack. Since you wanted something on the heavier side, I think this would fill the bill to perfection.
Or, what about flannel? I have a very nice blazer made from a 12-ounce Lesser flannel. It's somewhat lighter than true navy, but I think it's very striking.
Or, what about flannel? I have a very nice blazer made from a 12-ounce Lesser flannel. It's somewhat lighter than true navy, but I think it's very striking.