In golf, there is a tradition of wearing loud clothing: bright colors and bold patterns that you would never wear anywhere else, somehow are perfectly fine on the course. This is especially true of pants, and the preferred style is plaid. Perhaps the idea is to stand out against the grass background, or maybe it is a tribute to the Scottish origins of the game. Either way, red plaid certainly fits the bill.
Here’s a nice example – but only nice for the golf course I think:
Red plaid golf pants pictured: IZOD Golf Flat Front Fancy Plaid Mens Pants 34W x 30L Baked apple red