A Slinger: hat or helmet?

[hoplite14gr]

Usually slingers were recruited from the "working class". Mostly mountain dwellers and hunters. A felt or a straw hat would be available.
A succesful battle or even skrmishing and raiding could increase the possibilty of item aquisition through looting.
It is not unlikely that the slingers of the "Myrrioi" would be better armored than others.
Here you will see a red felt cup from Central Greece.
http://www.hoplites.org/HAfestival06-5a.htm (Middle pic - The guy with the candle)
Hope it helps you
Kind regards