It is narrated from Hazrat Aisha (may Allah be pleased with her) that when I was in the state of menstruation, I would tie a waist-wrapper around myself and then enter the Prophet's (peace be upon him) blanket.
Hadith Referenceمسند احمد / مسند النساء / 25375
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد كسابقه