Custom hat means the style, material, color, size and much more could be Customized as your request. For example style of snapbacks, fedora, panama hat, bucket hat, etc. Size from 48cm to 64cm.
You can try with CNCAPS to have your customized headwear from an idea to a real physical item.
All material, colors, and design would be as client’s request. More custom options you can find from Here.