“Walk modestly with your G‑d”—Micah 6:8.
A staple of Jewish life is tznius or tzniut (צְנִיעוּת), modesty. In the way we walk down the street, in the way we interact with others, and in the way we dress. As G‑d’s children, we must act and look the part, conducting ourselves with dignity and modesty. In common parlance, often refers to the uniquely Jewish way of dress.
Tznius Fashion
The exact parameters of the requirement to dress modestly depend on the time and place. But the basic idea—for both men and women—is to wear self-respecting clothing, clothing that does not demean the person within by overly accentuating the body, as if it, rather than the soul and its character and qualities, is the primary element of personality.
Thus modesty does not mean a denial of self, nor does it force us into hiding. Rather, it creates a private area—a dignified space—in which we can work to excel, without concern for external judgment and approval.
And even when we are alone, in the most private of places, we must also be appropriately dressed, for there is no place where G‑d is not present.
Tznius Guidelines
- Skimpy clothes that that are cut to reveal parts of the body, or tight clothes that draw undue attention to body shape as well as low necklines, are out.
- Married women cover their hair. The Lubavitcher Rebbe urged women to do so with an attractive wig, as opposed to simply wearing a hat or a kerchief.
- It is the accepted practice for Jewish women to wear skirts which are long enough to cover their knees, as opposed to trousers.

Thank you chabad.org for sharing this teaching with us. Could have gone a bit further with it.
To my understanding tzniut means not wearing fancy clothing at a job where clients are the poor.
It means not taking the subway wearing a fur coat to save on cab fare you can afford.
It means being kind to people who are having a rough time and possibly are acting out.
And much more.