In some Muslim countries and parts of Muslim countries controlled by certain religious fanatics in conjunction with paramilitary forces, there are strict dress codes, honor codes, and moral codes impressed upon women as well as to a lesser extent, on men. Some of these codes are interpreted very specifically in regards to what is appropriate dress for Muslim women so that outside of their home, Muslim women must wear either a burqa which covers the woman from the top of the head to the ground, or must wear a hijab, which covers the body and depending upon the prevailing religious viewpoint is combined with a niqab which veils the face. The upshot of all these rules, is that it is quite common to see women walking around wearing clothing that does not hint of their bodily shape, while also giving out very little facial recognition characteristics except perhaps a slit for their eyes, if even that.
This means that for Muslim women wearing a burqa or equivalent, that not only will it be somewhat difficult to determine whether indeed that the person behind the outfit is even female, it also takes away common human clues of the humanity of the person, herself. It could be though for those that deal with Muslim women wearing burqas on an everyday basis, that perhaps they are able to discern this or that about a particular woman, although one could argue quite strongly, that being that perceptive so as to have knowledge on the outside of who that person really is, defeats the whole purpose of the intended modesty of the person involved to begin with.
Most everyone has dealt with a clown or has seen a clown in person at one time or another, at a circus, or at a party or on TV. The thing about a clown is that a clown is by definition wearing a costume in such a way as to disguise the person so cleverly that it can be difficult to discern whether that clown is female or male. To the point, the hair is a ridiculous wig, the face is painted in different colors, the costume does not conform closely to the bodily shape, the clothes colors are bright and mixed, and the shoes are oversized and silly. All of this is done for show, and to make it typically easier for those watching to laugh at the silliness of the clown's antics which appeals to young children, most of the time, but not all of the time. The thing about clowns is, for instance using the Joker of Batman fame as a prime example, aka"The Clown Prince of Crime", is that because of the clown's makeup, exaggeration, and disguise it's difficult to see a clown as being human, in the same way that we see everyday humans, so that when a clown goes off the rails, it can get downright scary, tragic, and if necessary, it becomes easy enough to kill a clown.
It would be wise therefore, to remember that anytime you take a fellow human being and disguise them in such a way so as to place some significant doubt as to their humanity, their sex, and their identity, it then becomes much easier to take care of any dirty business, because in the killer's mind, the object being targeted isn't seen as a child of God.