From Madeit Patterns:
A collarless easy wear shirt with front placket and tab detail fastening and chest pocket is great for both boys and girls. The fully functional cuff has a neat gauntlet opening so roll up the sleeves if you like a different look. The fully faced out yoke detail gives a really professional finish, maybe put a contrast fabric in for a bit of a twist!
Make this style in sizes 2Y to 10Y