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Hirbawi restocked if anyone is interested in supporting the last Palestinian kufiya factory
(hexbear.net)
There's an auto-queue and at the time of writing this there's like 3600 people in it (and an estimated like hour wait), so no guarantee of anything being in stock by the time you read this; but I figured I'd post this in case anyone was waiting on them to restock. 
Any way you like for the conditions. It's a good breathable fabric so I use mine a lot in the summer to keep the direct sun off my shoulders and neck while still allowing some airflow. Once temperatures hit like 40 degrees I'm much more comfortable just covering up as much skin as possible and these keffiyehs are great for that purpose too.
It's a practical accessory in many types of uncomfortable weather and simply a beautiful accessory in all types of weather.