Mishmeret Tzniut is a special way of dressing and behaving in certain Jewish communities. It means being modest, which means not showing too much skin or wearing clothing that is too tight or revealing.
This means that you might wear clothes that cover your arms and legs, and that are not too tight on your body. You might also wear a head covering like a scarf or a hat.
This way of dressing and behaving is important because it is meant to show respect for yourself and also for other people. It helps people to focus on what is important inside of you, like your thoughts, feelings, and personality, instead of just looking at your body.
In some Jewish communities, Mishmeret Tzniut is a really important part of their way of life. It helps them to feel connected to their traditions and to feel part of their community.