Why do women wear garter belts Are they for 'aesthetic' purposes only?

My wife loves to wear them for her as she has said it makes her feel sexy, she has gone form a pantyhose only girl to garters and stockings only I enjoy that she is now always in a dress or a skirt and heels, she likes the attn she gets when she shows just a hint of her stocking welt, she even wears very short skirts with stockings and seams to the office very often