* Ancient Origins: Loose, comfortable garments were worn in various cultures long before the modern pajama. For example, the ancient Egyptians wore linen tunics and trousers, and in India, loose-fitting cotton garments were common.
* 17th Century Persia: The word "pajama" itself originates from the Persian word "pāy-jāma," which literally translates to "leg garment." In Persia, these garments were loose trousers worn by both men and women.
* 19th Century British India: British officers stationed in India adopted these loose trousers, often paired with a long shirt or tunic, as comfortable wear for the hot climate. They found them more comfortable than the traditional nightgowns or night shirts.
* Late 19th/Early 20th Century: The popularity of pajamas spread back to Europe and America. They became associated with comfort and relaxation, gradually becoming a staple for nighttime wear.
* Modernization: The design of pajamas evolved, with different fabrics and styles emerging. The classic "top and bottom" pajama set we know today became popular in the early 20th century.
Therefore, while there isn't a single "inventor," we can credit the evolution of pajamas to cultural exchange, adaptation, and the gradual shift towards comfortable, practical sleepwear.