These are pettipants designed to prevent the appearance of a visible Y-line. They can be worn under pants or skirts to prevent the color or lines of your underwear from showing, and can also be worn for protection against upskirting and accidental exposure. I think they can also be used as warm pants for protection against the cold in the coming season. I believe they are free size, but I'm not sure because there was no tag. There are two white pairs and one black pair. They have been home-laundered and are made of a material that doesn't wrinkle easily. Thank you for looking.