First off, hello and welcome to the site since I see it is your first post/thread!
Do you lift weights and/or do any strength/body weight training? It sounds like you have had fat loss as opposed to weight loss which to me is better because that means you'd have more muscles than fat. You may or may not have gained muscle but you probably are likely keeping whatever muscle you have and ridding the fat if you are still the same weight yet 2 sizes smaller? I'm actually jealous!
Also, when you say "diet", what is that for you if you don't mind my asking? Like in terms of calories, etc.
Love the polka dot shirt, BTW!