Gansey in Lancashire too but my family tended to refer to a fancy short sleeved pullover as a gansey for some reason. More like a Fair Isle. Maybe just a Swinton/Salford thing? It makes sense that fishing jumpers are named after islands. Aran, Gurnsey and, of course, Jersey! They had some lovely Yorkshire ones in Whitby a few years back. In what is now a jet museum and restaurant but was a craft type place. Very expensive though.