Lore has it that the British military conceived the idea of a dummy paratrooper in 1938 - since then, decoy paradummies have been used in various military operations to confuse the enemy.
Oddly, these 18" U.S. test dummies were molded with the appearance of tiny pilots (as opposed to looking like regular paratroopers.) Their nicely molded features included a pilot-style helmet, heavy jacket with thick collar and two large front pockets, short neck scarf, thick gloves, heavy pants tucked into tall boots, and arms folded up against the chest as if gripping a parachute harness.
The overall effect appears to resemble an old-fashioned pilot, in heavy flight garb, who has "bailed out." These dummies also have a slight resemblance to the famous Hollywood "Oscar" statuette which is given out at the Academy Awards. It is possible that this is why the paradummy first got it's nickname "Oscar."