A pajama is a Hindi word which signifies leg clothing. It originated from India during the 1880's where the first users were men. Instead of using nightshirts, men were using their pajamas when sleeping. Pajamas which can either be a one-piece (pants only) or two-piece (having a shirt and pants) are an outfit covering the legs while nightshirts are long shirts which are extended up to the knee. Now, pajama manufacturers also created a different version of pajamas for women.

Women pajamas are more of a fashion statement for women of the new era. North American young females are wearing pajama pants even in public to express their tastes in fashion. Chinese also publicly wear pajamas around their neighborhood. The use of pajamas is even incorporated in some television shows making it more popular.

However, the idea of using it never changed over the years. Still, it is used for lounging or sleeping purposes.

There are different varieties of women pajamas made of softer material like cotton (particularly flannel) or a luxurious material such as satin or silk and are created with loose fitting designs. These materials are very important because women are often very sensitive and meticulous. The manufacturers ensures that this areas are given due importance so that women are comfortable during their sleep.

- Flannel is made of yarn which is loosely spun to create a woolen fabric according to the level and degrees of fineness and weight. Moreover, flannel is commonly used to refer to the clothing which is made of flannelette. Flannelette is a woven cloth made of combined synthetic fiber and wool, or combined cotton and wool that can be either light weight or medium weight.

- Silk is made of natural fibers rich in protein woven in the form of textiles. It comes from the silkworm larvae's cocoon nurtured in captivity. This material can be very expensive because of its shimmering appearance. The silk cloth has the ability to refract the light penetrating on it at various angles because it has the ability similar to a triangular prism.

- Satin is woven using a warp dominated technique creating the fabric interlacing. The cloth's surface is glossy while its back is dull. Typically, the word satin refers to a fabric made of filament fibers which include silk, polyester, or nylon formed using the satin weave technique. The satin weave is more appropriately used in making fine clothing and evening wears. This became the most favorite material in making pajamas.

Now, there are other materials used for manufacturing pajamas besides these three major fibers. It includes linen, lace, acrylic, cashmere, chiffon, denim, crepe, fleece, down, leather, jersey, rayon, and micro fiber.