What a supine woman's panties create from hip bone to hip bone if she's thin enough. A good panty bridge is one that you can actually peek under and see her twat.

When you eat dirt for the first time and leave your family to build a shack in the woods

the phenomenon on a thin woman of the waist-band of her panties being suspended between her hip bones without touching her concave lower abdomen. This phenomenon is best achieved when the woman is lying on her back. Panty bridges are considered attractive by many not only because they demonstrate the thinness of the woman but, when viewed from the proper angle, provide a view of the top of the woman's vulva/pubic mound.