My older sister Mary, age 45, has been a nun for 13 years. (And yes, her name is indeed Sister Mary.) She's in the U.S., in an order called the Cenacle - currently based outside of Chicago. (Her order is based in France, founded in the early 1800s by St. Therese Couderc.)
Mary's one of the few nuns in her order under age 60. She prefers a nice cotton T-shirt for bedtime, and says many in her community do the same. She sports a number of vintage rock band shirts from the 1960s and '70s. She says she likes the updraft.
Mary's order is charismatic - lots of singing and dancing - and specializes in spiritual counseling/retreats for addicts and battered women. All her "ladies", regardless of age, have in common a supreme taste for fun and, despite the fact they wear civvies, play up the nun card whenever it will work in their favor.
Although she did take the vows of poverty (earns about $40/week), chastity and obedience, she is allowed to accept cash and prizes for her birthday and Christmas. And, of course, whenever she visits (gets a month's vacation every year), we pick up the tab for everything.