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A fancy robe you wear when you're too lazy to get dressed but still want to look rich
My mom wore her gaff gown to the grocery store. She looked like a queen who got kicked out of her palace.
He showed up to the party in a gaff gown. Everyone laughed. He laughed back. He was rich.
I wore my gaff gown to work. My boss said I was either a genius or a slouch.