It is narrated from the sister of Abdullah bin Rawahah (may Allah be pleased with him) (Sayyidah Amrah, may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Going out has become obligatory upon everyone who wears a waistband (nitaq)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21216