Wear bright colors.

Donning vivid colors will not only help your spectators spot you more easily, but race photographers will focus on you more, too. 

Plus, people usually look better in bright colors. 

Wearing black or white can make the shot appear washed out or too dark.

When it comes to donning denim, the biggest problem for me is my bottom.
ジーンズを着用するとなると、私にとって最大の問題はお尻だ。