"The Messenger of Allah ﷺ would fondle one of his wives while she was menstruating, if she wore an Izar (waist wrap) that reached halfway down to the middle of her thighs or to her knees." In the narration of Al-Laith: "Being covered with it." (Using translation from Nasāʾī 287)   

كَانَ رَسُولُ اللهِ ﷺ «يُبَاشِرُ الْمَرْأَةَ مِنْ نِسَائِهِ وَهِيَ حَائِضٌ إِذَا كَانَ عَلَيْهَا إِزَارٌ يَبْلُغُ أَنْصَافَ الْفَخِذَيْنِ وَالوَرِكَيْنِ» وَفِي حَدِيثِ اللَّيْثِ مُحْتَجِزَتَهُ