The longer the hijab/jilbab, the greater emphasis a person places on modesty and religiosity. Thus to wear a hijab that does not cover the neck is at one side of the spectrum whereas a jilbab that descends past the knees is another side of the spectrum. Traditionally, many Muslim women in Indonesia did cover there hair but not with the hijab or jilbab.
Here is one of the two interviews I completed at the Pluralusm conference I participated in.