Sometimes having the main colour of an object first in your sentence can be an identifier. Curtains that are black and white are a different set than those that are white and black. I'm pretty certain this is common shopping lingo.
Linguists call this collocation, i.e. words that tend to co-occur in a fixed way. Other examples are "Merry Christmas" (instead of "Happy Christmas") or "back and forth" (instead of"forth and back"). Not sure if this is a collocate in Norwegian, however.