The shooting jacket is the least versatile of the sport jackets, but possibly the most practical for its sport. When shooting skeet or trap, a gentleman might find his shoulder bruised or unduly worked by the butt of his shotgun. To mitigate this unfortunate occurrence, the gentleman’s shooting jacket is outfitted with a special padded shoulder that is made of a suede or nubuck material. Generally, the oversized pockets have an overlapping, scalloped flap that buttons so contents — shotgun shells maybe — do not fall out.
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For further reading, I recommend a book that is full of very tweedy characters, but is often overlooked because of its film adaptation: Walsh, Maurice, The Quiet Man and Other Stories