Plain dress is a religious practice in which people dress in clothes of traditional modest design, sturdy fabric, and conservative cut. It is used to show humility and to preserve communal separateness from the rest of the world. It is practiced by some Amish

Amish

The Amish , sometimes referred to as Amish Mennonites, are a group of Christian church fellowships that form a subgroup of the Mennonite churches...

, Brethren

Schwarzenau Brethren

The Schwarzenau Brethren, originated in Germany, the outcome of the Radical Pietist ferment of the late 17th and early 18th century. Hopeful of the imminent return of Christ, the founding Brethren abandoned the established Reformed and Lutheran churches, forming a new church in 1708 when their...

, Hutterite

Hutterite

Hutterites are a communal branch of Anabaptists who, like the Amish and Mennonites, trace their roots to the Radical Reformation of the 16th century. Since the death of their founder Jakob Hutter in 1536, the beliefs of the Hutterites, especially living in a community of goods and absolute...

s, Mennonite

Mennonite

The Mennonites are a group of Christian Anabaptist denominations named after the Frisian Menno Simons , who, through his writings, articulated and thereby formalized the teachings of earlier Swiss founders...

s, Quakers

Religious Society of Friends

The Religious Society of Friends, or Friends Church, is a Christian movement which stresses the doctrine of the priesthood of all believers. Members are known as Friends, or popularly as Quakers. It is made of independent organisations, which have split from one another due to doctrinal differences...

, and Muslims

Muslim

A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 among others. Hasidic

Hasidic Judaism

Hasidic Judaism or Hasidism, from the Hebrew —Ḥasidut in Sephardi, Chasidus in Ashkenazi, meaning "piety" , is a branch of Orthodox Judaism that promotes spirituality and joy through the popularisation and internalisation of Jewish mysticism as the fundamental aspects of the Jewish faith...

 and Haredi Jews

Haredi Judaism

Haredi or Charedi/Chareidi Judaism is the most conservative form of Orthodox Judaism, often referred to as ultra-Orthodox. A follower of Haredi Judaism is called a Haredi ....

 also dress plainly, rabbi

Rabbi

In Judaism, a rabbi is a teacher of Torah. This title derives from the Hebrew word רבי , meaning "My Master" , which is the way a student would address a master of Torah...

s in particular.