The Mudcat Café TM
Thread #53303   Message #3904621
Posted By: GUEST,Mick Pearce (MCP)
09-Feb-18 - 12:13 PM
Thread Name: DTStudy: Hot Ash-Pelt (Hot Asphalt)
Subject: RE: DTStudy: Hot Ash-Pelt (Hot Asphalt)
My shorter OED give Jersey knitted work or worsted - 1587, jersey - wollen pullover 1836, guernsey - woolen pullover 1851.

All etymology that I can see for Irish geansai give it as derived from Guernsey, though whether that usage for a pullover is earlier than the English words in the same context is not clear, but would seem unlikely.