Men’s Journal aims to feature only the best products and services.  If you buy something via one of our links, we may earn a commission.   It’s been a long, long time since the holiday classic  Christmas Vacation  made the turtleneck (technically, a mock turtleneck)  sweater   look ridiculous . So long, in fact, that turtlenecks have gone all the way back to being cool again.  Let me explain: The turtleneck, originally worn primarily by men, was once a potent symbol of power and...