The terms, "thong" and "g-string", are both used to describe similar types of underwear. Though some claim the terms are interchangeable, there are subtle differences between the two.
A thong is a style of underwear designed to have minimal coverage of the buttocks. From the front, a thong is virtually identical to a bikini bottom. From the back, a thong panties is a strip of fabric worn between the buttocks.
A G-string is actually considered a type of thong. It consists of a triangular wedge of fabric in the front, and a string or thin elastic strip in the back that sits between the buttocks.
The most notable differences between a thong and a g-string are visible from behind. A thong will have a strip of fabric, usually at least an inch wide, on each side, and a small, fabric triangle at the top rear. A G-string is much thinner than a thong, and the strip of fabric along the waistband and between the buttocks will be a "string" or merely a piece of elastic.
The practical reason to wear either a thong or a G-string is to reduce visible panties lines, which are the edges of a woman's undergarments that can show through form-fitting clothing. Since thongs and G-strings are designed with little fabric, there are fewer lines to show through.
In 1981, a lingerie company Frederick's of Hollywood popularised the thong as a must-have item of underwear for women, and called it the "Scanty Panty".
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