Phyrigian cap.

[Geoff5]

I have just purchased and am waiting for my Galic helmet. It will have a sewn in cover inside already but I was wondering if I could get hold of a phyrigian cap, as I have been advised of their suitability and preference to the sewn in to the helmet variety.
I have no knowledge of how to take one myself. What`s the best way of getting one and taking into account that I have little hair left on my head, so I guess a small to medium size would be best?

Thanks for any advise.

Geoff.