Originally posted by Epirot
(PIE) keleuo - (Maced.) kelav/kjelav - (Croat.) chelav
The word 'chelo' may perhaps come from this word as the forehead is bare. But, as it is present in all Slavic languages, and as Albanian already has a word for 'forehead' (balle), it cannot be a loan into Slavic languages.
Actually I cannot bring any direct image of Illyrian hat discovered on archeological places of Illyrians because I have not the book of Alexander Stipcevic (I gave it to a mate of mine). But as far as I know, Illyrian cap did not differ much from Roman ones.
While I was searching for the origin of Albanian cap, I found also this one that may bring some more light on the question
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