But usually people prefer to wear red and yellow ropes. Mainly because these two colors are conspicuous, red means good luck and yellow means full of gold and silver. Plus brave means lucky, so red and yellow are luckier.
Ancient sages believed that fate was predestined, but it could be changed. Therefore, the people have a good wish of "being brave at the first touch, being brave at the second touch and being brave at the third touch".