Simple trench coat cape mod I've been using since a teen : r/lego
BrickLink - Part 973pb3251c01 : LEGO Torso Trenchcoat over Dark Gray Jacket with Silver and Copper Clasps Pattern / Dark Tan Arms / Light Nougat Hands [Minifigure, Torso Assembly, Decor.] - BrickLink Reference Catalog
3 CUSTOM polycotton Trench coat / capes for your Lego minifig. NO MINIFIGURE | eBay
Bricker - Part LEGO - 973pb3835c01 Torso Black Trench Coat with Black Shirt, Silver Buttons and Belt Pattern / Black Arms / Black Hands
CUSTOM pilot trench coat or jacket - Choose from various styles. No Lego minifig | eBay
1930's Lego Gangster | He has my custom trench coat | Sean-Michael Griffin | Flickr