Red is a primary color which looks attractive when it comes to dressing as well as fancy customers and wigs. We all love clowns, and they are instantly identified with their signature red color noses. You would never spot a clown who carries a nose which is other than red color.
Here are possible reasons behind this act.
"Mr. Jacobs's whiteface makeup with its gargantuan, goofy smile, outlandish eyebrows, and the plum-sized nose was the emblem for the Ringling circus, and he may have been the world's most famous living clown."