Roll the sleeves of your button-down at your elbows.
If you don’t want to wear a hat, try a bandana that matches the color of your button-up shirt. Keep the tied part on the side of your head, and tie it like a bow.
If you plan on wearing your boots in muddy or wet conditions, consider getting a pair with rubber soles.
Tie the bandana behind your neck so that the triangle part is facing your front. (Only if you wore the cowgirl hat instead of the bandana)