A Muslimah might be in perfect hijab with the oval of her face showing but a man (Muslim or not) with bad intention is still going to stare / lust at her face so that would imply hijab (without niqab) isn't sufficient? Or she should not be free mixing anyway... But she is allowed to go to the market and interact with the shop keeper? So it could be argued even in hijab the whole body is covered but the most interesting part (the face) is not so would this not infer niqab is mandatory? What's the % of Muslimahs who wear hijab that veil also? Not much?