What is "quality" in the sentence "the jacket you bought is very good quality"?
The jacket you bought is very good quality.
This sentence is from a grammar book. I don't know how "quality" works in this sentence. Firstly, I don't think it is a noun because if it is, "of" is needed before "quality". Secondly, dictionaries say that "quality" as an adjective is used only before a noun, so basically you can't say "something is quality" like "something is red". So, I wondering if "quality" is an adjective and something coming after it might be omitted. What is "quality" in this sentence?