Catholic Answer
Nuns wear many different kinds of robes depending on their order. Classically, they wear a robe which may be black, white, brown, grey, or even other colors. Some wear a scapular over this, a long shoulder wide cloth that hangs to the ground in the front and back, sort of an apron. Most classic nuns habits have a white helmet like affair that ties around their head. Some nuns wear a wimple, which is a white bib like affair that goes under their chin, some nuns wear a veil over the headdress which may or may not have an underveil. Other nuns wear a coronet. ("The Flying Nun) kind of headdress). Underneath, nuns used to wear medieval type underwear, heavy woven stockings, many petticoats - and yes, underwear.
Many post-Vatican II nuns in nations like the United States modified their habits (the official name for the outfits) until they ended up, with, in many cases, only a modified cross, an uncovered head, and polyester pantsuit. The Vatican has asked that all nuns wear a distinctive habit, and many orders have gone back to their original habit, or a modified version of the same. The picture of the "modern nun" in dress or pants with no head covering is going the way of the dinosaur, and will be gone in under a generation. Most nuns wear a wedding ring. At their solemn profession they often dress in a white dress as they are getting married to Our Blessed Lord.
More input from Answers contributors:
The religious costume is usually referred to as a Habit, such as Dominican Habit, Franciscan Habit (also used by male Franciscans- it is usually brown). and so on. There are many different varieties of Veils, wimples, quimpes or guimopes ( sort of like a breastplate) and arrangements of crosses, etc.
a habit
Yes, nuns as well as most people wear pajamas.
Ursuline nuns wear black dresses and a black and white head dress to show their religion.
They are supposed to wear habits, but many choose not to.
the ursuline nuns came to new France to establish religious settlements.
Some orders of nuns wear a wedding ring as a symbolic "marriage" to Jesus and their faith. Nuns are not God's wives.
Different orders wear different colors, Benedictine nuns wear black, Cistercian nuns were white, and there are others. Regardless of the color, the entire "outfit", if you will, is called a habit, you can see more of an explanation at the link below:
Yes, nuns can wear regular clothes when they are not in their religious habits. Some orders allow nuns to choose their own attire, while others may have specific guidelines for casual dress.
Buddhist nuns (bhikkhunis) wear robes (civara). The robes have different names in different countries and different schools of Buddhism.
Nuns wear head coverings as a symbol of their religious devotion and humility, following traditions that date back centuries in various religious orders.
Conceptionists, or nuns blonging to the Order of the Immaculate Conception. They are Roman Catholic.
Catholic Answer:Some orders of sisters or nuns do wear a wedding band showing that they are married to Christ. Depending on the local culture, they wear it on either the left or right ring finger.