Arrived promptly. My daughter is 7 1/2 and of average size,(about 52lbs),  all except for a more curvy rear. She doesn't wear jeans, and we have a hard time having bathing suit bottoms that cover well. Well, we ordered size 8, and the bottoms not only cover the rear well, but come up a bit higher in the front. The top was a bit, maybe 1/2 size too big. Not a huge problem, I rolled up the sleeves & put a few stitches in. She also wanted the ruffle rear out, so I scrunched up the back a little, and tacked it with thread just to make her happy. Overall it fit well, and she could have worn it fine without my adjustments.
Would recommend