The term 'collar accessory' refers to items that are worn around the neck or collar. The two crossword solutions for this term are 'STAY' and 'IDTAG'. A STAY is a stiffening piece of material, such as whalebone, that is used to support the shape of a garment, such as a shirt collar. An ID tag is a small item, usually made of metal or plastic, that is attached to a collar and contains information about the wearer, such as their name or address. Both stays and ID tags are commonly used as collar accessories.