Here I have a selection of 1970s deadstock (unworn vintage, probably from a shop or factory closure) girl's shirts.
They're polyester with buttons down the front and awesome dagger collar and turned back cuffs.
Chest size is 26" so, depending on the size of your child and fit desired, could suit a 5, 6, 7, 8yr old.
I have a few colours available.
Super funky, and better than buying new!