Doctor Damage
I'll Lock Up
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Here's a screenshot from a Joel McCrea film (I think it's Foreign Correspondent) which shows what those little flaps are on the upper chest of trench coats. They are often called gun flaps, but I call them wind flaps. Although McCrea is not in focus in this image, you can see how when the lapel is fully buttoned up the small flap buttons down over the top of the lapel to keep the rain from dripping down inside the lapel (and inside the coat).