Sir, you bring-out the poet in me. The topcoat is a fall/spring coat which is lightweight and is not intended for the very cold weather. It essentially follows the model of a classic overcoat except that its cloth is lighter. It comes in raglan sleeves and set-in sleeves. Unfortunately, it is becoming extinct. The all purpose, removable lining raincoat (mostly Burberry) has taken its place. It is not as elegant. I cannot recommend specific shops in your town. Hickey Freeman used to make a top coat called the "Flight Coat". I think that it still makes it. I have one. If Brooks Bros. and your local Oxxford outlets don't have one in stock they should be able to do MTM. I would think that the same applies to Hickey Freeman. The classic NYC shops have topcoats, such as J. Press, Paul Stuart, and Brooks. BTW, Press has a store in DC. Turnbull & Asser have a classic topcoat. Finally, there are bespoke tailors. I know that Beaman goes to DC. My tailor, Davies & Son, will return to NYC in January. Of course, there is George de Paris in your fair city. Good luck.