From BR Bullpen
The golden sombrero comes from hockey's hat trick, three goals in a game. More grand than a hat would be a sombrero that is gold. It is awarded to any player who strikes out four times in a game. A platinum sombrero for five strikeouts or a titanium sombrero for six strikeouts may be awarded but they are much rarer than a golden sombrero.
A player may also take the collar when he has a golden sombrero.