When the menstruation is over, is it necessary to wash the clothes I wore during that period? Please advise.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.

You are not required to wash the clothes you wore during menstruation unless they were soiled by menses or other impurities. However, Muslim women should have special underwear for menstruation. This will be better and easier for them.