Is one allowed to be unclothed in the bathroom or shower room because its not generally a problem to be unclothed there (i.e. people shower in the room anyways)?
The Shulchan Aruch O:CH 2-1 says that a person should try to stay covered even in the privacy of his own home. The reason is because we are always in the presence of H-shem. R’ Moshe Feinstein (Igros Moshe Y:D 3-47(3) explains that although it is normal for a person to be dressed more when outside in public then when at home. However a person should be careful even at home to stay dressed to the degree that would be considered appropriate, such as how he would dress when there are others visiting. Regarding the bathroom, shower room, etc. he says that since it is place that is meant to be uncovered when needed that it is permitted to be unclothed there when changing, similar to the need when taking a shower etc. This however would apply only to the amount of reasonable time that it takes to change or do what has to be done, but not that a bathroom is a place that one can just be unclothed for no reason.