Sportkilt makes some contemporaries. The boulder and commando models might be what you are looking for.

For underwear, something shorter like briefs or short trunks may be better in the heat. I know my local walmart sells some unusual silky (I think it was microfiber) briefs which are extremely lightweight and breathable. They're a bit odd, as they have sculpted pouch instead of the usual fly hole, but once you get past the fact that they are essentially man panties, they are quite nice.