the same size?

On Sunday we were sitting in sacrament meeting and Alan went to tuck Emmie's tag into her dress. He then leaned over to me and whispered that Emmie was wearing Sarah's dress. We had them in their matching Christmas dresses and sure enough Emmie was in Sarah's size 4T and Sarah was in Emmie's size 2T. They weren't that obviously different until I saw that Sarah's sleave was a wee bit high on her wrist and the skirt seemed a bit short for her. At an opportune moment we snuck off to the restroom and switched dresses.