John Lewis uniform sizing, do they run big or small? Please help

[mummyeme]

Ordering my daughter a pinafore, but I wondered how their sizing is. She's a small 4 year old so wondering whether to order 3/4 or 4/5. If they come up big she'll need a 3/4 IYSWIM.
Thanks in advance

BIG
(but my children are small)
a 3-4 art apron sort of fits ds, nine

Thankyou, really like the bib pinafore they've got.
Crikey. that is big!

Well it's a bit of a squeeze (I bought the wrong size, understandably given its massiveness, and he tried it on for a joke) but yes, it does go on.

Don't want to get dd a bib pinafore with a skirt that starts at her knees, that would be a sight .
I know how you mean, in some shops the clothes are HUGE for age, thanks for helping