The hijab is a veil that covers the head and chest, which is often worn by Muslim women beyond the age of puberty in the presence of adult males outside of their immediate family as a form of modest attire. Under Indonesian national and regional law, female head-covering is entirely optional and not obligatory. The sole exception where the hijab is mandatory is in the Aceh Province on Northern Sumatra with its overbearing morality police who enforce its wearing in public.
Street portrait photographs of Muslim beauties from Sumatra in Matt Hahnewald's
Flickr Album 2012-05a Flirting with Muslim Beauties