In Malaysia (and also Singapore, Brunei and Indonesia), Muslim men often wear sarongs to go to the mosque. Indian men around Malaysia are also frequently seen in a white sarong.
My father is neither Muslim nor Indian but he wears a sarong at home. He picked this practice up from his father, my grandfather. My grandfather's parents were Chinese born in Indonesia and this is probably where the whole sarong wearing practice started.
My father is the last person in the family that wears a sarong and I doubt that there will be anybody else that picks up the habit. I'm not sure that I would encourage Aaron to wear one but if he one day decides that he likes it, I wouldn't tell him not to. Of course, I doubt that he'll look as cute in it then as he does now.