Although I am new here (as my tag indicates ), I learned a very important thing about the forum. When stefan gives his opinion just agree with him

And since "the assumption would be premature without direct experimental data" how about an experiment that we can try as follow:
I am sure most of the people here knows how each snake acts upon their movement towards it. So if we just add a color plastic film (I guess available in all electrical hardware shops) with certain color and try wearing different colors of cloth. According to the results we can see if the snake is able to detect the movement in all colors or not...