A guernsey, or gansey, is a seaman's knitted woollen sweater, similar to a jersey, which originated in the Channel Island of the same name, sometimes known as a knit-frock in Cornwall, especially Polperro.
The guernsey is the mainstay of Guernsey's knitting industry which can be dated back to the late 15th century when a royal grant was obtained to import wool from England and re-export knitted goods to Normandy and Spain. Peter Heylin described the manufacture and export of "waste-cotes" during the reign of Charles I. The first use of the name "guernsey" outside of the island  is in the 1851 Oxford Dictionary,[clarification needed] but the garment was in use in the bailiwick before that.
The guernsey was traditionally knitted by the fishermen's wives and the pattern passed down from mother to daughter through the generations. While commercially available sweaters are machine knit, the final finishing of these machine-knit parts is completed by hand.
Mary Wright argues that the use and wearing of guernseys throughout the British Isles for over a century and a half almost justifies the guernsey for qualification as a national costume. A guernsey from the Folk Museum Guernsey was included in the 2010 BBC project A History of the World in 100 Objects.
The term can also refer to a similarly-shaped garment made of woven cloth, also called a Guernsey shirt or smock. There are a number of different names for the same garments, for instance Guernsey frock, Guernsey shirt, smock-frock, or fisherman’s frock. Essentially these are all the same garment, with the materials varying based on the purpose for which it is worn.
Two styles of guernsey exist: a plain "working" guernsey and a "finer" example that was generally saved for special occasions and Sunday-best attire. Traditionally, Ganseys were seamless and worked in the round using the circular knitting method.
The "working" guernsey design was kept simpler in order to reduce the amount of time and materials needed to produce. The sale of knitted garments to supplement family income was important to many island families and thus the garments that were sold were also of a simple design. It is estimated that a total of 84 hours was needed to complete a guernsey: a simpler design could be produced faster than a more elaborate one.
Twenty-four principal patterns have been identified in Cornwall alone, each one again drawing inspiration from ropes, chains, waves, nets and sand-prints.
Worn as a source of pride and often knitted by prospective wives "to show the industrious nature of the woman he was about to marry", the "finer" guernsey was more elaborately patterned than its working cousin. With the advent of the machine-knitted guernsey and the decline in the knitting industry, this guernsey is a much rarer sight.
It is not uncommon for a guernsey to last several decades and be passed down in families. Guernseys knitted for children were knitted to be "grown into" and often came down to the knee.
Use in the British Armed Forces
The guernsey was first widely used in the rating uniform of the 19th-century British Royal Navy. It is said that guernseys were worn at the Battle of Trafalgar (although these were probably made from woollen cloth, rather than knitted).
Orders for variants of the guernsey have also come from the Intelligence Corps, the Mercian Regiment, the Tank Regiment and Gurkha Logistics where they form part of officer uniforms.
Use in other languages
The translation for the word "jumper" or "sweater" in the Goidelic languages, Irish, Scottish Gaelic and Manx, are "geansaí", "geansaidh" and "gansee" respectively, all borrowings from the English guernsey/gansey.
- Mary Wright, Cornish Guernseys & Knit-frocks, 1979, 2008 Polperro Heritage Press
- "22 May 1803 - Classified Advertising - Trove". Trove.nla.gov.au. Retrieved 20 March 2022.
- Marr, L.J. (1982), A History of the Bailiwick of Guernsey Philmore & Co. Ltd
- "The Story of the Guernsey". Archived from the original on 22 July 2007.
- Wright, M. (1989) Cornish Guernseys and Knit-froks, Alison Hodge/Ethnographica Ltd.
- "BBC 'A History of the World'" accessed 23 June 2011
- "The Guernsey Shirt, Smock or Frock""Behind the Wardrobe Door: The Guernsey Shirt, Smock or Frock - the National Trust of Guernsey". Archived from the original on 28 September 2011. Retrieved 5 September 2017. accessed 6 July 2011
- Lambert, G.A. (2002) The Taxonomy of Sweater Structures and Their Origins, Raleigh
- Pearson, M. (1984) Traditional Knitting:Aran, Fair Isle and Fisher Ganseys, Van Nostrand Reinhold Company
- "The History of Rating Uniforms""The History of Rating Uniforms : Uniforms : RN Life : Training and People : Royal Navy". Archived from the original on 18 April 2006. Retrieved 4 March 2006. accessed 6 May 2008
- "Traditional Guernsey knitwear and genuine Alderney sweaters from the Channel Islands" accessed 6 May 2008
- "The guernsey becomes a fashion must-have"  accessed 22 June 2011
- "geansaí", Wiktionary, 8 December 2021, retrieved 3 January 2022
- "geansaidh", Wiktionary, 17 May 2021, retrieved 3 January 2022
- "jumper in Manx - English-Manx Dictionary | Glosbe". glosbe.com. Retrieved 3 January 2022.