Was on Valor last week and there were 2 robes in my room. I used it for showering only, but there were several people who wore it down to the pool. They are hanging in one of the closets, so you'd just leave them there when done.
Whatever you do, don't lose them as you will be chartged for them at the end of the cruise if they are not there for your steward to pick up. If you do wish to b uy them ask your steward to bring you some brand new ones.
Robes are available for all passengers in any cabin just for the asking. On the last day of our cruise on the Spirit last November, it was declared "Robe Day" by some and you would see many wearing theirs though out the day. Many used their robes during the week by the pool because you can't go to the buffet in swimwear. A coverup, ie t-shirt, shorts, etc is required.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean