I bought the ihram garments, and the set came with three pieces, two pieces like towels, one for the upper part of the body and the other for the lower part. As for the third piece, it is to be used as a kind of underwear on the lower part. The three pieces are not stitched, but they have two metal snap fasteners for securing the garments.
Does the fact that it has two metal snap fasteners to secure it make these garments unacceptable according to sharee‘ah? I heard that it is not permissible to wear the third piece that is described above – is that correct?

When I went to do ‘umrah, I was menstruating, so I did sa‘i and cut my hair, and I exited ihram and put on niqab. I waited until I became pure, then I did tawaaf at the Ka‘bah. I did this based on the ruling on Hajj, which says that the menstruating woman should do everything except tawaaf. Please note that I am not married. What is your opinion, may Allah bless you?