In the movie Camelot, Lancelot told Guenevere that "your face has a luster, that puts gold to shame."
What does "put to shame" mean in this context?
Learn English – What Exactly is Meant by “X Puts Y to Shame?”
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I usually hear (and say):
The only stupid question is one not asked.
I'm surprised no one has mentioned what khakis actually means in some non-rhotic accents. Non-rhotic accents are ones in which the r sound is only pronounced when it's followed by a vowel (e.g. right); the r is silent elsewhere. Khakis is a humorous pronunciation-spelling of car keys in some areas of the USA (such as Boston). The r is silent because it's followed by a consonant, so it's pronounced KAH-KEEZ which could alternatively be spelt khakis.
Here's an illustration from A Historical Phonology of English by Donka Minkova (p274):
I assume it also means car keys in the quote in the OP:
You are not the car you drive
You are not your fucking khakis! [car keys]
Best Answer
"X puts Y to shame" means "X is so good at something that Y, while normally good at that thing, looks terrible in comparison."
Gold is something with a lot of luster, but Lancelot is telling Guenevere that her face has much, much more luster than Gold -- not literally, of course. This is an example of hyperbole.
"X puts Y to shame" can also be used without hyperbole. If a famous runner is outrun by an untrained amateur, it could be said that the amateur put the runner to shame. Quite literally, he caused the runner to be ashamed by failing to be better.