'Colourway' is a term used to describe the paint treatments for a given model year. It may have been stolen from the rag trade but I'm not sure.
Wait - now I'm sure.
colourway noun /[HTML_REMOVED]#712;k[HTML_REMOVED]#652;l.[HTML_REMOVED]#601;.we[HTML_REMOVED]#618;//-[HTML_REMOVED]#602;-/ [C] UK specialized
a combination of colours in which cloth or paper is printed
The sweaters are available in two colourways: grey/pink or blue/white