Abstract: An adjustable aperture containing hat apparatus includes a head-covering portion, an aperture portion defined by the head-covering portion, and an aperture size adjustment assembly attached to the head-covering portion, adjacent to the aperture portion, for adjusting the size of the aperture portion. Preferably, the aperture portion is located at a top central portion of the head-covering portion. Ordinarily, a hat brim is attached to the head-covering, but can be brimless. With using the adjustable aperture containing hat apparatus, a person's hair braids (ponytail or dreadlocks) can be threaded through the aperture portion, and the aperture size adjustment assembly contracts around the bases of the hair braids (ponytail or dreadlocks).