Dont' worry I've been seriously tempted into buying girl clothes. Ive some seem pretty stinking cute sunday dressed and clothes that ive just about bought them. I'm just afraid i'll jinx myself or something. However though, if done right even boy clothes can look pretty cute on girls, specially since it seems you got some pretty cute tomboys in the making.!
If it helps, I've had a bag full of little girl clothes since I was pregnant with Alex. They were some of my favorites of my niece's clothes, so my sister hung on to them for me.Perhaps your day will come :)