Discover children’s costumes for Book Week, Halloween and dress-up parties, with supplier-labelled sizes overlapping ages 10–12.

This is a browsing shortcut, not a universal size chart. The selection includes labelled ranges such as 8–10, 9–10, 9–12, 10–12 and 12–14. Not every costume fits every age in this group. Check the exact age range and supplier measurements on each listing before choosing. Generic Small, Medium or Large labels alone are not used to determine age fit.