Something you have never heard.

childhood we are told not to stand in front of a bull when wearing a red dress, because the bull is more likely to attack us.

 Red does not make the bull angry. In fact, compared to healthy humans, bulls are partially color blind so they cannot see red.

 According to the book "Improving Animal Welfare" by Temple Grandin, cows do not have red retinal receptors and can only see yellow, green, blue and violet colors.

The vision of a cow to the vision of a human with red-cone color blindness known as protanopia Very similar. 

They have a red cap with a yellowish-gray tint. It's the menacing, swaying motion of Madore's red hat that angers a bull, not the color.