Felt Costume Beret - Bright Colored Painter Costume Hats Adults and Children by Funny Party Hats Beret measures 11 inches in diameter and has elastic stretch, perfect for children or adults. Oo la la, show some French flare with this black beret. Also makes a great costume accessory for a painter costume. This felt beret is made from 100% polyester. It is a fabulous beret and looks great on.