Fun and flirty red shirt, unknown size, unknown brand

This fun and flirty red blouse has an elastic waist. It is sleeveless and lightweight. Can be worn to work, paired with a pencil skirt and some sexy red heels. If I had to pick a size, it would be a medium only because that's the majority of the tops that I own, but I can't be too sure. Obviously this is previously owned but well taken care of in a smoke-free home.