Don't buy the size you usually buy in them. They are at least 1-2 sizes smaller than usual. Spend a few bucks more and buy branded clothes in a standard size that fits you or your child.
Castle Fairy Communion Pageant Bridesmaid Girls' Clothing for Dresses
54 Review
UNACOO 2 Pack Sleeveless Cotton Dresses Girls' Clothing
62 Review
Rainbow Toddler Princess Sleeveless Sundress Girls' Clothing and Dresses
57 Review
Fancy Girls Communion Dresses White Girls' Clothing in Dresses
53 Review