There are a couple of child sized B3 flight jackets on Ebay USA. If you type in "kids B3 jacket" into the search bar, two such jackets show up. There is a size 6 and a size 8. At the price, they might be perfect for your kids. John

John Linkosky

1995 4/4
2005 Roadster
2016 3W Superdry Edition