>>2453340For me, it's the shemagh.
Cheap, versatile, works as a scarf, sun protection, wind protection, mask, protection from mosquitos, works /out/ as well as in the city. Can be repurposed for survival larping if the need arises as well.
If I go fishing, I tend to wear a fisherman hat, with a band to attach hooks to, or just my shemagh as usual.