U R gorgeous! I wore a similar dress before. I wore a Firm Control Slip Strapless Shapewear inside, to make upper body firmer and curvier. Don't know whether or not U R too young for that. Would U consider a dress with full skirt? Show & Dance.
I'd say this dress is too young for you actually if you are 40. Also the outfit you have with the vest and pink tight skirt isn't very age appropriate for you. So you don't really have room to judge.
i would save this for when you're 30. you have a really nice figure you should show it off and wear something fun while you can get away with it! you won't be able to for much longer
I don't know where you live but Top Shop in the UK is great for girls your age and they do everything from day wear to going out gear. They probably sell on-line.
@Booboo13 - yep. At 13 you can just go for it and follow this simple rule: if your mum/older sister or anyone 20+ could wear it - you don't. You have plenty time ahead of you to wear this type of clobber.