24:31 And tell the believing women to reduce [some] of their vision and guard their private parts and not expose their adornment except that which [necessarily] appears thereof and to wrap [a portion of] their headcovers over their chests and not expose their adornment except to their husbands, their fathers, their husbands' fathers, their sons, their husbands' sons, their brothers, their brothers' sons, their sisters' sons, their women, that which their right hands possess, or those male attendants having no physical desire, or children who are not yet aware of the private aspects of women. And let them not stamp their feet to make known what they conceal of their adornment. And turn to Allah in repentance, all of you, O believers, that you might succeed.
33:59 O Prophet, tell your wives and your daughters and the women of the believers to bring down over themselves [part] of their outer garments. That is more suitable that they will be known and not be abused. And ever is Allah Forgiving and Merciful.
https://www.youtube.com/watch?v=GM7RUcT05RU
I've heard from at least two other Muslims that it is, but so far as I know that might be a matter of interpretation.
I think they are mistaken. I would say that it is not an encouraged thing to do. But not considered a sin.
I don't know what reading the Quran is supposed to do in terms of giving me evidence. The evidence I need is of the supernatural. Not just of the supernatural, but evidence that is stronger than the supernatural claims of other religions (or at least good reasons to believe that the supernatural claims of Islam are correct and those of other religions are false).
The way I thought is that as you read Quraan you would be able to reflect on things and would be in a position to tell if that sounds like the truth or not because you were familiar with Christianity I think.
Are you not convinced that God exists ?