Bigger than she needs, but can't rely on the numbers.

I have DD#1 mostly in size 10 clothes as she is quite tall, but her school uniform dress is a size FIVE and swims on her.

Uniforms at our school aren't cheap so I have her in 3 tshirts, a secondhand rugby top ($60 new!!), the one dress ($75!!!) and for everything else I get $10 tracky pants and windcheaters at Target, noone seems to notice I am saving $50 by getting a navy jumper that doesn't have navy embroidery with the school name on it.