I HAD ORDERED THE 6x FOR MY GRAND DAUGHTER. I DIDN'T CHECK THE LABEL ON THE SWIMSUIT BECAUSE THE PACKAGING READ 6X. SHE WORE IT THIS WEEK FOR HER SWIM LESSON AND IT WAS TOO TIGHT IN THE SHOULDERS. I WISH I HAD CHECKED IT BEFORE SHE WORE IT AND NOT BELIEVED THE PACKAGE LABELING. SOMEONE GOOFED. THE SWIMSUIT ITSELF IS VERY NICE.