What is the Catholic nun outfit called?

The outfit worn by Roman Catholic nuns is called a habit. It resembles a long tunic and typically has two sets of sleeves, of which the larger is worn down during ceremonies or when inside a chapel. The habit is commonly black but can be other colors, such as white, depending on the specific religious order.

A habit is the main piece of clothing worn by a nun. It is generally loose, pleated at the neck and draped down to the woman's ankles. A nun may also wear two underskirts with the habit. Nuns may choose to wear an apron to cover and protect the habit while working.