Very cute! Love the colors and the lights. I just had my daughter wear an undershirt but overall, love it!We loved this costume. It was a big part of my granddaughter birthday on this passed Saturday. She was so BEAUTIFUL, and she love it.Lo pedí para el cumpleaños de mi niña con tematica de sirenita. Me gustó muchoI daughter loved this dress for her birthday. You really need to wear leggings with it though. The dress lighted up and looked great. However the strap the goes around her neck did rip off after about 1 hour of wearing the dress, so don't pull on it very hard.Perfect size & magical light up dressThis dress is cute. My 4 year old wares 5T so I choose accordingly, 5/6... it's a bit large, but you can make it more snug when you tie the halter around the neck... lights are super Brite! My only issue is there isn't a liner under the lighted tulle skirt.... so it can be pokie if day on....Since the Theme of my granddaughter s . Third birthday was mermaids I purchased this dress from Amazon The dress itself is lovely and when you put on the lights underneath the tule is gorgeous She had to put it on immediately during gift openings. She look beautiful in it well worth the moneyI bought one sized 5-6 and one sized 7-8. They were both the exact same size. Both packaged with an L on it. Which makes me think they are Large. They fit my 5 year old. I feel like it's deceiving to give the option of two different sizes but not actually have different sizes.