Millinery stock is a term used to describe the inventory of HATS that a store or business has available for sale. It typically includes a variety of styles, colors, and sizes of HATS, ranging from casual to formal. The term is derived from the word 'MILLINER, ' which refers to a person who designs, makes, and sells HATS. Millinery stock is an important part of any hat store's inventory, as it allows customers to find the perfect hat for their needs.