In my opinion, the tweed topcoat should get more respect. Single breasted, with raglan sleeves like the coat on the right in the Esquire illustration, a ghillie collar, slash pockets and turnback sleeve cuffs, it is good looking, hard wearing, warm and rain resistant. It is cost effective as well, since the simple construction of the raglan sleeves means made to measure versions are effectively indistinguishable from bespoke and the entire coat can be made on a sewing machine.
Tweed topcoats have been a wardrobe staple for travel for nearly a century, performing the same functions as a lined raincoat with considerably more panache. Executed in patterns on blue, gray or brown grounds, they are a reasonable length that is not too heavy for wear in a conveyance. And on a trip, the same coat looks fine over denim and boots as well as oxfords and a suit.
A man looking for appropriate topcoat cloth should focus on Donegals, Cheviots and other suiting tweeds in weights ranging from 15 to 18 ounces (450 to 540 grams). Most tailors will ask for the same amount that they require for a jacket and trousers, but be sure to add 10% for pattern matching.
And that is the practical tweed topcoat.