Ibn Taymiyyah said:
“The way in which to tell what is for men (i.e, their dress code) and what is for women is by the custom and what is suitable and what befits the two sexes and that which the religion has stipulated for them both with regards to their dress code.
Women’s beauty should be concealed from men at all times and they should not expose themselves to strange men. They are forbidden from wearing trousers, hooded cloaks, short dresses and so forth.
Women are also ordered to not raise their voices due to the fact that their voices affect other male’s hearts in public and this is one of the reasons why women are not allowed to raise their voices in the call to prayer. They should not make du’aa (supplications) or thikr (words of remembrance prescribed in the sunnah) out loud in the presence of non mahrams, nor do they climb Safa or Marwa (two smal mountains in Makkah). So the women are advised to cover their faces and hands from non-mahrams.
It is related in An’ni’hiya that men should have certain clothes which distinguish them from women and vice-versa: women should have clothes that distinguish them as women.”
[Majmoo’ Al-fataawaa, 22/148]