Don't get hung up on the size. If you feel bad about yourself because a 12 is what fits, take a Sharpie, and write '6' on the label.
Your personal style should evolve with age. To say you want the same style at 25 as at 45 is a mistake.
I know what it feels like to struggle with your weight, and it makes me understand why women get attached to numbers on a scale or a dress size. It doesn't mean that I have gotten over all of it myself, because I have good days and bad days just like everyone else.
Not one person I know isn't concerned with their appearance. To trivialize fashion is to rob ourselves of a great tool.