What size clothes does Nicole and Aloenka Blick wear?

I’m planning to get Nicole and Aloenka by natalie blick and was wondering what size clothes they wear?

I bought mine 5t and some 5-6

\the one I did wears a size 3 …I used size 5 for Angelica and Gabriella but Nicole is not as large as them…Maybe sizes vary depending on where you live??? She wears an Aussie size 7 shoe…

Thank you!