>>1853559Wide linen clothing is the most comfortable. Wide denim pants are an acceptable compromise if you need durability (if there's thorny vines or cactii around, they'll tear through linen).
You'll also need either a hat and facemask (shemagh or similiar, against dust) or a turban and sunglasses.
As for boots, I don't know. Since the place I live in only has desert-like climate for 2-3 months a year, I usually tough it out with regular hiking boots I can also use in winter.