Save for the Agnelli tweed, all the LL cloths I have had made up were for odd jackets where I don't mind the weight. I never could get my mind around using the cloth for suiting with most of my time spent in overheated buildings.
Definitely still available AFAIK. NMWA offered a Formosa suit or two from the book so I gotta believe you can still get it.Also agree 100% with GC that you won't notice any tangible difference between 12 and 13oz cloths.
For '83, besides Chateau Margaux, other wines from the appellation that I have had recently and are still killer are Palmer and Cantemerle. Some '83 Pomerols are also still showing quite well, L'Evangile in particular.