Abstract: Structures for retaining sunglasses on a hat, such as a baseball cap, are disclosed. Such structures may be in the form of sleeve assemblies that are attached to either side of the hat and configured to retain the temples of glasses. Various embodiments enable glasses to be positioned on the brim of the hat while being secured by placing the temples of the glasses through the sleeve assemblies. In some embodiments, the sleeve assemblies may be provided in a kit for application to hat.