I have an overcoat from that, and love the heavy 25oz. cloth. It is, needless to say, nothing like Storm System.
^ I don't have any specific recommendations, but if you're using Rubi, they are reputed to have quite a nice collection of house hopsacks.
I would also suggest you tread carefully in the world of patterned linen. I have found linen to provide enough surface interest by itself, and imo the inclusion of a complicated POW pattern would be a bit much.