My dog might be a nudist

...All of a sudden, she refuses to wear sweaters. She literally bounces around the apartment, so excited to go out, and when I shove on her sweater, she does this:

Just stands perfectly still and stares at me. I had to pick her up and carry her onto the elevator this morning. So I'm thinking either she's a fashionista and knows how hideous these sweaters are (this particular one was a gift from the dog-walker), or else she prefers au naturel. But I'm sorry - it's 30-something degrees outside! Weirdo.