Lounging pyjamas are comfortable and perfect for spending a relaxing day indoors. But if you're looking for another term to refer to them, there are several synonyms that you can use. These could include loungewear, which is a more general term for comfortable clothing worn at home. Other options could include cozy pants, leisurewear, or even sweatpants, which are often synonymous with a relaxed and comfortable outfit. Ultimately, the term you choose will depend on your personal style and preference, but any of these options should serve as a suitable alternative to "lounging pyjamas".