For sun protection only. They should lace at least to the ankle. Sun protection is a must. For shooting use a wide-brimmed straw, canvas or poplin hat. As an alternative use poplin baseball style cap.
Stray shots are always possible so wear protective shooting glasses.
However, frequent cold fronts can drop temperatures close to freezing. They should lace at least to the ankle. Snake Chaps or Boots are recommended as a safety precaution . Hip waders are sufficient for Duck hunters. Stray shots are always possible so wear protective shooting glasses.