Sayyidah Aishah (may Allah be pleased with her) said: It is appropriate for a woman, when she has reached maturity, to keep a piece of cloth; then when her husband has intercourse with her, she should give it to him so that he may wipe himself clean with it, then she too should wipe herself clean, and then they may pray in those same clothes which no filth has touched.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4134