Ruling on combining wudu' and ghusl from janabah

Question:
Is it permissible for a person to perform wudu' inside the bathroom while showering, before he puts on his clothes?

Answer:
We are not aware of any harm in this if he performs ghusl from janabah or on Friday. However, it is better to begin with wudu' in the ghusl for janabah; that is, he should perform wudu' and then perform ghusl for janabah, and the first wudu' is sufficient for him. This is because the Prophet (peace and blessings be upon him) used to perform wudu', meaning he would clean himself and wash what had affected his private parts and the area around them, then perform the wudu' for prayer, and then perform ghusl. So when he finished the ghusl, he was finished with everything, and he did not need to perform wudu' again afterwards, unless he broke his wudu' after the ghusl by touching his private parts or by passing wind. In that case, he would repeat the wudu'. But if he performed ghusl and did not touch his private parts, did not pass wind, and did not break his wudu', then his first wudu' is sufficient.
As for the ghusl for Friday, if he wishes, he may perform wudu' before it, and if he wishes, he may perform wudu' after it. The ghusl alone is not sufficient; rather, wudu' is required either before or after it. And if he performs wudu' before or after it while naked, there is no harm in that, because he has undressed to perform ghusl.