I was at a pub sing last and someone sang a fast chantey-style song about a gansey (guernsey) sweater. Some lyric snippets that I caught:
In my 13th year I first set sail...
didn't catch a cod nor a fish nor a whale but was warm in the [something] guernsey
..towin' the line
...made by my mother who knit herself blind

I've searched high and low and can't locate anything related to any of these lyrics. Would love some help!