Snoods
A decorative bow on the head is often called a hair bow or simply a bow. It is a popular accessory for adding a touch of style or whimsy to hairstyles.
Net weaving is a permanent way of putting one's hair (a style) where a net is attach to a client's head, then attaching the hair to the net.
The decorative top of a column is called the capital.
The way I do it is to tuck up the back of your hair to the top of your head and fold depending on the lenght of your hair. Then put the net over your hair and then move your hand and put the front of the net on the very top of your forehead.
The function of the hair net is to control loose hair so that it does not fall into and contaminate the food being prepared.
The decorative curl on the end of a violin is called the scroll.
The decorative wood on a staircase is called "wainscot"
"Decorative" when describing fruit trees, means no fruit. It is called a decorative Red Plum tree.
Well it depends because when I had my hair braided I never put it into a hair net but it might as well help the hair to stay nicer.
A hair net is also known an caul. It is elasticized and is used in the laboratory as a safety device to keep hair contained.
A decorative garland of flowers is a lei.
For your hair ?