Clothes that are Fluffy. Usually made from fleece (polyester), acrylic or other soft materials.
Commonly (but not exclusively) seen in Pajamas, Loungewear or Sleepwear as a set consisting of a striped Hooded Jacket and Shorts.
Distinct from fur clothing such as fur coats or jackets, which is usually made from and resembling real or faux animal fur.
This type of fluffiness is commonly referred to as 「もこもこ」 (mokomoko) in Japanese.