After attending Friday prayers last week, Handriansyah got down to work at his headquarters in Jalan Menteng Raya, Central Jakarta Commander of the Brigade of the Islamic Youth Movement, he was trying on clothes like a teenager heading to a party.

At first he wore green, covered up by a long white jubah, the long, flowing gown often worn by Arab men and other Muslims. Not long afterwards a friend helped him put on his headband. They put it on