“If he strikes out three times in a game it’s a hat trick. Four times is a sombrero (bigger than a hat). Five is a golden sombrero.” Barry Laswell, Clarion-Ledger (Jackson, MS), August 7, 1979, p23
“An 0-for-three game is a hat trick, but an 0-for-four game wins you the golden sombrero.” Terry Monahan, Times-Advocate (Escondido, CA), August 7, 1980, p41
Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1ST USE. 1984. “I almost got the Golden Sombrero. That’s when you strike out four times, see. I only got the regular sombrero [hat trick]” (Chicago Cubs first baseman Leon Durham, quoted in Chicago Tribune, Apr. 14).