G-strings, otherwise know as thongs (no, not the ones you wear on your feet!), are not as popular as they used to be, but still have a strong die-hard following of women looking to avoid a visible panty line caused by the seam of the underwear. There are modern alternatives to avoid the VPL, such as laser edges & boylegs/boyshorts. but the best way is to avoid the seam altogether, and that's to wear a g-string. Some are designed to match the bra, many are stand alone.