Don't. And I'm going to repeat that for effect, even though it doesn't work nearly as well written as it does said. Don't, buy any clothes for your children, from Disneyland Paris, without trying them on first.
I'd promised myself that we'd buy a new princess dress for our Cheeky Monkey No. 1 while we were there. The first shock was the price. They cost roughly 59Euros with the smallest sizes sometimes, but not always, cheaper, and for those of you still trying to work that out in your head it's £52 or $86. So it's not something to buy while you're there if you can really help it. They are definitely cheaper at home.
However, I didn't know this, and had 'promised myself', so I figured 'Carpe Diem' and let her pick her favourite. She picked the Rapunzel dress unsurprisingly, and I picked up a size 6 (meaning '6 years old') to try on. She's nearly 5yrs old, and I figured that if I'm going to spend the money, I want her to get some wear out of it before it's too small.
The size 6 was just right. And I mean 'just right'. So knowing my daughter she'd grow out of it within a week. And frankly, after a large bowl of pasta, it would have been tight around the middle!
So we picked the next size up to try. It was probably only about an inch, if that, wider around the middle, and was now just above the floor. Any bigger and she'd be tripping over it. And what size was it exactly? An 8. My 4 year old daughter was in a dress supposedly designed for an 8 year old!?
I similarly ended up with a size 6 for my 2 year old.
I should point out in the strongest terms that I don't have round children! They are probably slightly smaller than average if anything.
So beware, and try on first.
Having said all that, she looked absolutely gorgeous! Have fun!