When ever Messenger of Allah ﷺ wanted to fondle any of his wives during the periods (menses), he used to ask her to wear an Izar.  

سَمِعْتُ مَيْمُونَةَ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا أَرَادَ أَنْ يُبَاشِرَ امْرَأَةً مِنْ نِسَائِهِ أَمَرَهَا فَاتَّزَرَتْ وَهْىَ حَائِضٌ وَرَوَاهُ سُفْيَانُ عَنِ الشَّيْبَانِيِّ  

Maimunah daughter of Al Harith said “When the Apostle of Allaah ﷺ intended to associate and lie with any of his wives who was menstruating, he ordered her to wrap up the lower garment(loin-cloth) and then he had association with her.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا أَرَادَ أَنْ يُبَاشِرَ امْرَأَةً مِنْ نِسَائِهِ وَهِيَ حَائِضٌ أَمَرَهَا أَنْ تَتَّزِرَ ثُمَّ يُبَاشِرُهَا  

[Machine] "When the Messenger of Allah ﷺ wanted to have sexual intercourse with one of his wives while she was menstruating, he would command her to wear an izar (lower garment)."  

«كَانَ رَسُولُ اللَّهِ ﷺ إِذَا أَرَادَ أَنْ يُضَاجِعُ بَعْضَ نِسَائِهِ وَهِيَ حَائِضٌ أَمَرَهَا فَاتَّزَرَتْ»  

[Machine] "When the Prophet ﷺ wanted to have sexual intercourse with one of his wives while she was on her period, he commanded her to wear a cloth and then had intercourse with her."  

«كَانَ رَسُولُ اللهِ ﷺ إِذَا أَرَادَ أَنْ يُبَاشِرَ امْرَأَةً مِنْ نِسَائِهِ وَهِيَ حَائِضٌ أَمَرَهَا أَنْ تَأَزَّرَ ثُمَّ يُبَاشِرُهَا»  

[Machine] "Narrated by Maymuna, the wife of the Prophet ﷺ , she said: When the Messenger of Allah ﷺ wanted to have sexual relations with one of his wives while she was menstruating, he would command her to wrap herself in a waist wrapper."  

عَنْ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ قَالَتْ كَانَ رَسُولُ اللهِ ﷺ إِذَا أَرَادَ أَنْ يُبَاشِرَ امْرَأَةً مِنْ نِسَائِهِ وَهِيَ حَائِضٌ أَمَرَهَا فَاتَّزَرَتْ