When and how did the habit of wearing pajamas form?

The term "pajamas" in Greek and Urdu refers to loose pants worn in the room at night. But later, British and French fashion designers (European colonists) living in India were innovative and wanted to change its style. The designers improved on this loose trousers and designed a special style for people to wear at night. Pajamas for sleeping. By the second half of the 19th century, pajamas had become popular in European countries.