Anne C. Goater, A Short Treatise on Head Wear, Ancient and Modern
“ Our modern hat can be traced back to the pileus worn by the ancient Greeks when on a journey. Hats with brims were also worn by them, though some authorities claim [8] that the Greek citizen of mature years never wore a head-covering, it being confined to youths, workmen and slaves. The pileus was a closely-fitting woolen skull-cap, which was sometimes worn as a lining to the helmet. It was adopted by the Romans at their public games and festivals by those who had once been slaves, and by the aged and infirm for sake of warmth. ”
