the reason is the topic of his song,it talks about a guy who receives a call while he is taking shower and his wife picks it and it says " my love" so the woman gets angry and leaves and he says to the girl in that song that its a misunderstanding and he will wear normal clothes again the day she'll return in his life because his disarray started in bathroom
haha i also found it strange but at the end of the day it seems like it worked out for him as a promotion technique,that song was by far the most sought after by those who buy songs to their names in the group