"We have purple gloves."
Translation:Nous avons des gants violets.
I, too, would like clarification. "Orange" and "marron" do not take an "s" when plural, but "roses" and "violets" do. Is it only flowers that do, or fruits & nuts that don't? Is there another rule? If they must all be learnt individually (which I accept if it is so) does any one have more examples of those colours from nouns which do NOT take an "s"?
It seems most adjectives do take the extra "s", but some don't. This article lists some of the latter: https://www.thoughtco.com/invariable-french-adjectives-1368796
Regarding colours, according to the article, "French color adjectives derived from nouns, such as animals, flowers, fruits, gems, and metals, are usually invariable".
No. It's a different colour.
poupre = crimson (deep red)
violet = purple
Yes, it's absolutely required. Read this for more information: https://forum.duolingo.com/comment/3722348/When-are-articles-required-in-French
If you're learning on PC, I suggest reading the tips and notes associated with each module because I think you should have come across this by now.
Please explain why gants requires violets but chaussettes requires orange. Both are a pairs of something. Is it determined by the subject i.e. Nous avons des gants violets vs Elle a une chaussettes orange? Nous meaning more than one pair of gloves and elle meaning one pair of socks?