not only mallus some other races also tend to think its okay to go out in lungi. a few days back a srilankan friend argued with me regarding the same thing as he was wearing a lungi (the call sarong) with a highlighted blue shirt and said in Sri Lanka rich folks dress like this in parties... i was like Haa!O)

Lungis are truly very comfortable garment but are well suited indoors in your own house. its no disrespect to the culture of lungi but its respect to onlookers of a different culture or similar.

at least save the assumption that under the lungi there are no undergarments :D