Domenican sisters wear an all white habit, as do Cisterians nuns, and I believe Carthusian nuns.
Ursuline nuns wear black dresses and a black and white head dress to show their religion.
Nuns and the Amish
the ursuline nuns came to new France to establish religious settlements.
They changed from mostly black with little white to mostly white with a little black
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:
The white cloth that covers the head of a nun and which is tied tightly under the chin..
Missionaries of Charity nuns wear white and blue saris as a symbol of their commitment to serving the poorest of the poor. The white color represents purity and simplicity, while the blue borders signify their dedication to Mary, the mother of Jesus. This distinctive attire reflects their vow of poverty and their mission to live a life of humility and service. The uniform also fosters a sense of unity and identity among the nuns.
Other nuns
Monks and nuns do the monks' and nuns' jobs now.
Ursuline nuns wear black dresses and a black and white head dress to show their religion.
nuns