The first layer of the female Cerian travelling uniform is the insulative one-piece undergarment found in many men and women's costumes in Cerey. These garments are essential for Cerey, being surrounded by ocean on one end, mountains on the other, and riddled with waterfalls, it is very windy and the nights can get very chilly, especially when flying at high altitudes.  The garment is dense and prevents the wind from piercing important parts of the body while preserving freedom of movement necessary for flight.