A panty brief consists wholly or partly of elastic textile material, preferably made by knitting or crocheting, and is formed as a flat, substantially rectangular bag which is closed along three marginal zones. The bag is open in the whole extension of one longitudinal edge to provide a waist opening...http://www.google.es/patents/US4729131?utm_source=gb-gplus-sharePatente US4729131 - Panty brief and a method of making same
