I usually use my wife’s wide-brimmed gardening-hat-with-side-flaps. With flower motif 
Good thing it’s dark at night…
In the heat of summmer, I just go with her oversized gardening sun visor.
Otherwise (like if someone might see me), I’ll often use the hood of my hooded sweatshirt. In winter, I wear it under my coat and put the hood up over my knit cap, which always eventually makes the cap come off my head, but… the cap can be repositioned. Alternatively, my main winter jacket has a detachable hood I can attach, though I haven’t done that this winter (worked well enough the last two years though, so maybe I should try it again).
In summer the sweatshirt is a total no-go (too sweaty). Besides the above-mentioned sun visor (mainly used in my yard), sometimes in summer I’ll just go with a baseball cap. The caps and visors and such are also good for spraying with Off! to help keep the skeeters away.
None of these are ideal. Best part about the hooded sweatshirt is having the front pouch — great for carrying accessories when grabbing and going. All of the above definitely help though