Could you please tell me the meaning of "crazy" in the following excerpt from the second chapter of The Great Gatsby?
“I like your dress,” remarked Mrs. McKee. “I think it’s adorable.”
Mrs. Wilson rejected the compliment by raising her eyebrow in disdain.
“It’s just a crazy old thing,” she said. “I just slip it on sometimes when I don’t care what I look like.”
“But it looks wonderful on you, if you know what I mean,” pursued Mrs. McKee. “If Chester could only get you in that pose I think he could make something of it.”