This page says that the words to MY OLD SKILLARA HAT appear in "Walton's New Treasury of Irish Songs and Ballads 2."

Funny thing: if you Google with "Skillara", all you find are (1) references to the song (with varying spelling of OLD/AULD/OULD); and (2) the obscure expression "Skilla and skillara!" in a discussion of the World Cup at a Jamaican forum.

Can anyone explain what "Skillara" means?