Bandanas. . .very versatile!!
I wear a bandana on a daily basis. Have for the last 25 or so years. I have several 100% silk bandanas. They keep me cool in the summer and warm in the winter. I wear one under my wool cap in the winter for the ultimate warmth combo.
If I get too warm (while working) I can take my wool cap off and my head remains warm with the silk bandana on, yet it allows me to cool off so I don't get too overheated. ;)
They are big enough to work as a sling -- in the event I should need one, but hopefully not! :( ;)