If you haven't missed out on a buck because the sun got in your eyes when you were trying to get ready for the shot, you haven't been hunting long. Same for if you haven't suffered in the stand because the errant weatherman called for a cloudy day so you left your billed hat at home. Fact is, in very sunny weather, regardless of your quarry, you need a hat with a bill to help keep the sun out of your eyes. Even with sunglasses, a billed hat makes seeing game animals easier. If you're sure it's going to be cloudy, a sock hat or beanie will get the job done. But be sure and have an adjustable billed hat in your pack so if the sun comes out you can put it on over your sock hat or beanie.