A denim skirt, sometimes referred to as a 'jean skirt' or 'jeans skirt', is a skirt made of denim, the same material as blue jeans. Denim skirts come in a variety of styles and lengths to suit different populations and occasions. For example, full-length denim skirts are commonly worn by women whose religious beliefs prohibit them from wearing trousers, including Orthodox Jews, some Muslims, Mennonites, and Pentecostals, among others. Shorter skirts made of denim are commonly worn by teenagers and young adults. Some are modeled after an exact style of jeans, with a front fly, belt loops, and back pockets. Others are constructed more like other types of skirts, with a column of front button, closures on the side or back, or elastic waists. Like jeans, denim skirts vary in shades of blue, ranging from very pale to very dark, or occasionally in other colors. During winter and colder months, denim bskirts are often worn with leggings or tights.