Final answer:
Authorized hair holding devices vary by institution and are typically conservative, matching hair color or being invisible, and must keep hair neatly in place.
Step-by-step explanation:
The type of hair holding devices authorized for wear can depend on the specific organization, company, or institution's dress code policy. Typically, in professional settings, hair holding devices such as hair ties, barrettes, hair clips, and headbands should be conservative in color and style to maintain a professional appearance.
In some cases, such as in the military or certain private institutions, there may be more restrictive regulations that outline which types of hair holding devices are permitted. These rules often require that devices match hair color or be invisible, and they must serve a functional purpose in keeping hair neatly in place.