Start with high-confidence kids fashion books, then narrow by subgenre or adjacent topics.
Dress Code
Véronique Hyland
Everyday Dress of the American Colonial Period Coloring Book
Peter F. Copeland
Bad Girls of Fashion
Jennifer Croll, Ada Buchholc
My Big Sticker Dress-up: Cutie Patooties
Louise Anglicas
Little Book of Chloé
Caroline Young
Shoes!
Anna Davies, Daisy Wynter