Said when something compliments or suits one well. Oh wow, that dress, it's you! That shade of green looks great against your skin. A: "What do you think of this painting?" B: "Oh, it's you, for sure. It would look great with the rest of your décor."
It suits you perfectly.; It is just your style. John (trying on jacket): How does this look? Sally: It's you! Sue: I'm taking a job with the candy company. I'll be managing a store on Maple Street. Mary: It's you! That's a nice step up, and that store is so close by.