Thong
The thong is an undergarment and swimwear, worn by both sexes but more commonly women. The style characterized by a thin strip of material along the center of the garment's back designed to sit between the wearer's buttocks, connected directly to the bottom front of the garment and to both sides of the front at the top via a waistband. Basically, it is a narrow piece of cloth, leather, or plastic that covers or holds the genitals, passes between the buttocks, and is attached to a band around the hips. At times the rear area became so narrow that it would disappear between the wearer's buttocks.
A similar item is the G-string, of which the back consists only of a string. The two terms G-string and Thong are often used interchangeably; however, they can refer to distinct pieces of clothing. A G-string is one variety of thongs. See the design and variety of thongs for details. Thongs come in a variety of styles depending on the thickness, material, or type of the rear portion of fabric and are available for both men and women throughout the world. It is known as the "fio dental" in Brazil. Since, the thong is essentially a panty with a strap in the back, it is often called a T-back.