1. a loose-fitting garment worn for sleeping, typically consisting of a jacket and pants; usually used in the plural form 'pyjamas'
Usage: Chiefly British English; American English typically uses 'pajama' or 'pajamas'; Most commonly used in plural form

Examples

• She changed into her pyjamas before bed.
• He wore striped pyjamas to sleep.
• The children put on their pyjamas after dinner.
• My pyjamas are made of soft cotton.
• She bought a new set of pyjamas for the winter.