In the Church of Jesus Christ of Latter Day Saints, you can get baptized at eight years of age. I have a daughter that is coming right upon eight and I made her a dress to wear to her baptism. She won't be wearing it during the actual baptism (they have white jumpsuits for that), just before and after.
I used a modkidboutique pattern, Kyoko. The fabric is a white with white embroidery lined with muslin. I used white linen for the sash and grosgrain for the ties.