S.B.
My daughter is three and LOVEs her boxer briefs..she wanted undies like her Daddy and brother. At this age, she won't care. Little boy undies may work. The iron on transfers will work, but they don't hold up well to washings. I tried that with my son and after one or two washings they were crumbled messes. Last year my son wanted Ghostbuster undies and shirts, so I used acrylic paints to make them. A year later they are still around. I am NOT a painter, but this was pretty easy to do. PM if you want to know how I did it.