Is it permissible for a woman to walk naked from the bathroom through the passageway to the bedroom?
Answer:
A person must act with tzenius (modesty) even when he is alone in his room, and walking around naked does not match this principle (this is not a formal prohibition, but violates a basic code of modesty).
Therefore, wherever possible, a person (man or woman) should ensure that covered parts of the body are not uncovered. If clothes are in the bedroom, one should wrap himself in the towel on the way to the bedroom, and get dressed under the towel, or in the bathroom.