I'll bet they were more water proof and comfortable than the frigg'n canary suits they have us wear now. While you're at it, I'll take a British Warm too and the Square Rig. 
The
British Warm was a rather stylish, comfortable overcoat: neither as warm nor as utilitarian as a greatcoat.
British Warm GreatcoatBut it, the
British Warm, had the advantage of being useful and very acceptable as a civilian overcoat (minus, of course, the rank badge slip ons).