Jack Wills sizing

[monkeysmama]

My 14yo sister would like this Jack Wills dress for Christmas. Anyone know what the sizing is like?

I missed the 30% off code last week. If anyone has a new one I'd be very grateful .

I think quite big. I tried on a similar dress there in the summer and a 10 was HUGE on me (I'm a 10 in most shops), I have a couple of Breton tops from there and bought size 8