I do now require a headband when doing yardwork, otherwise the copious sweat just falls all over my glasses. A tie die kind of headband might work for me.
https://www.junkbrands.com/products/60s-summer-headband-bbl?lshst=collection
https://www.junkbrands.com/products/peace-headband-bbl?lshst=collection

I was looking at these hats, but for a full-blown hat, I just feel a burning need for something a whole lot floppier. Dunno why.
https://www.hippieshop.com/collections/mens-headwear/products/rainbow-woven-hemp-hat
https://www.hippieshop.com/collections/mens-headwear/products/rainbow-tie-dye-hemp-hat

P.S. Ooh, almost all of these images make me smile. Not sure I want any of them just for me, but maybe I could take a plain ol' big straw hat and decorate it to my liking.
https://www.designtrends.com/fashion/hat-designs/hippie-hat.html