I like sharkskins in Harrison's Premier Cru Book. 11 ounce if that will work for you.
Out of curiosity, do you remember what we used for my sharkskin suit?
Still wondering what navy fabric might be right for an odd jacket. I saw a twill one (all wool and looking kinda rough) - does that count? Vox' coherent combinations thread doesn't include it:
Looks like this, just in navy:
The availabe hopsacks are all to light in color...