I wouldn't worry about her at this age, either. My daughter is 16 and is still more of a tom boy, but I took her out to lunch today and she wore a cute little mini skirt. I'd have had to drag her kicking and screaming to get her in a dress or skirt at 6. She used to tell me that she wanted to be a boy when she was smaller. Now, she's happy to be a girl and has boyfriends, etc (and I know she likes boys right now as I'm rather open and she knows I would not be disappointed in her if she preferred girls).
What all of that long winded nonsense is saying - let her wear her suit. If anyone asks, smile and say, "Oh, it's the latest fashion." And let it go at that. I'll bet she looks adorable. When she starts to notice boys as boys and not playmates, she just may want to wear a dress now and again. If not, that's okay too.
Christine
Life is not measured by the number of breaths we take, but by the moments that take our breath away.
Cycle! It's Good for the Wattle; it's good for the can!