While I doubt an adjective can modify another one, I'm wondering if it may be possible. Here is the example: "An immaculate black three-piece suit." Most likely, I'd have to use the adverb immaculately to modify black, but I could be wrong. What syntactic parses are possible for “an immaculate black three-piece suit”?
(Also, if someone has an answer as to why bright in “a bright red car” is grammatical, I’m all ears. Bright is an adjective meaning—in that context—vivid and bold [as Oxford defines it], yet it is modifying a second adjective: the color red. Is bright, or any other word describing color, like light in light red, the only adjective that can get away with this?)