In the 17th, 18th, and 19th centuries, some doctors wore a beak-like mask which was filled with aromatic items. The masks were designed to protect them from putrid air, which (according to the now-obsolete miasmatic theory of disease) was seen as the cause of infection. The design of these clothes has been attributed to Charles de Lorme, the chief physician to Louis XIII.
Based on Paul Fürst's circa 1656 copper engraving of plague doctor, Dr. Schnabel from Rome. No Copyright Infringement Intended