JUst wondering how the girls sizes come out? Do you tend to go up or buy at age range? I get a lot of things from Gap and tend to go up so at the moment for dd3 aged 2.5 I'm buying age 3, for coming up to 9 year old dd2 I buy age 10 tops and 8-9 bottoms and for dd1 I would buy 10-11 trousers and 12-13 tops. They are all pretty average in build. Thanks in advance for any advice!