If bright poppy colors are not your little prince's style then why not go for a classic striped white shirt. 

A crisp white shirt is a must-have clothing item in everyone’s closet. Pick this classic striped off-white shirt for your child and dress him up in it for any formal occasion or even for a casual birthday party. It can be paired with everything from solid coloured trousers to blue denim depending on whether you want to dress up your boy or dress him down. You simply can't go wrong with a white shirt.