For the attackers (IS?) maybe this has two benefits: kill your enemies and isolate “your” women from the rest of society. https://nyti.ms/2OaZGvZ?smid=nytcore-ios-share
«Two male attackers, wearing full-length burqas to hide explosive vests and automatic weapons, entered the mosque in the city of Gardez in Paktia Province, first firing at the worshipers and then detonating the vests, according to the Afghan police.»