Pyjamas is an alternate spelling of pajamas—the clothes you wear to sleep in. The spelling pyjamas is typically used by speakers of British English. The word is commonly and informally abbreviated as p.j.'s. You could say that whatever clothes you change into before going to bed are your pajamas or a loose usually two-piece lightweight suit designed especially for sleeping or lounging, called also pj's.
Pyjamas or pajamas are popular as sleepwear is that they can provide utmost comfort, primarily because of their fabric material. This means the fabric is gentle on even sensitive skin, helping you sleep better. These types of fabrics are also very breathable, keeping you cool. This helps promote better sleep.
Silk, Cotton, Modal tend to be the most popular material and you can find different styles, colours and shapes in Maison SL from different designers.