The Prophet ﷺ said, "Whoever believes in Allah and the Last Day must not enter the bathhouse without a waist-wrap."
أخبرنا إسحق بن إبراهيم قال حدثنا معاذ بن هشام قال حدثني أبي عن عطاء عن أبي الزبير
عن النبي ﷺ قال من كان يؤمن بالله واليوم الآخر فلا يدخل الحمام إلا بمئزر
[hasan] Reported by Hakim, 4:288, from the hadith of Ishaq bin Ibrahim, in full, and he graded it sahih according to the criteria of Muslim, and Dhahabi agreed with him. The hadith has many corroborating narrations in Tirmidhi, no. 2801, 2802, and elsewhere.