I may be able to help you here Anthony, i have an old recording of a one off documentry made by the bbc about 20 years ago, it follows a seanetter (spelling?) crew out of Amble (Northumberland) fishing for Cod, its about the politics of restricted fishing and the like but most is on the boat working so has loads of pics of what they wear and the boat, in and out, i'd be happy to send you a copy (we put it on DVD as it has lots of friends on it you see) if thats ok copyright wise, i'm not sure how passing on a recorded from TV DVD works, copyright wise......i doubt it will ever be shown again or made available for sale as it was only relevant at the time......opinions please.
The jumpers are know as Guernseys
http://www.guernseyknitwear.co.uk/
 and tradionally a family would have its own pattern, we have the same here (we pronounce it gansey) but its a more aran pattern, look here
http://www.iriss.co.uk/kits.htm
at the Oiled Aran jumper kit, but imagine it blue, dirty and stinking of fish and you have a high % of northumberland lobster and cod fishermen........if you ever need pictures of seanetters or cobles just yell i'm only a 5 minute walk from the harbor.......Steve, the Ex fisherman (i got sea sick :o)