Be sure the sweatband is non-absorbent to prevent pesticide poisoning. Avoid cloth and plastic mesh caps. They will absorb pesticides. Pesticide protective clothing should be used only for pesticide protection and not for general rain protection or other uses. Clean the protective equipment after every use, with a thorough soap and water washing and lots of rinsing, so it is safe and inviting to wear the next time.
Eye protection is also very important when working with agricultural chemicals.
Chemical goggles have a baffled airway that prevents a direct splash from getting inside the goggles. Ordinary safety goggles do not have this feature. Guidelines for Handling and Laundering Pesticide-Contaminated Clothing. The publications are available from county offices of the NDSU Extension Service.