It is perfectly acceptable and indeed appreciated if women wear an abaya. The prostitute comment is just plain wrong.

As for men wearing thobes, this is also acceptable. I have spoken to many locals and every single one of them has said exactly the same thing. I have even been given several thobes as gifts which I wear when being invited to meals at their houses. The one and only thing that is offensive here is ignorance. If you try and fit in it will be appreciated.

And thems the facts folks.