I got 8/9 for my 8.5 year old daughter. She had to use a string to hold them. In my opinion they are oversized. However, she likes them and wears them with the thread as tight as possible. If your kid is rather thin, I would choose the size smaller.
UNACOO 2 Pack Sleeveless Cotton Dresses Girls' Clothing
62 Review
Rainbow Toddler Princess Sleeveless Sundress Girls' Clothing and Dresses
57 Review
First Communion Dress Line Ivory Girls' Clothing and Dresses
56 Review
Castle Fairy Communion Pageant Bridesmaid Girls' Clothing for Dresses
54 Review