Perhaps some kind of star or something would be more apropos. I think yellow would be a pretty color
Germans had different colors for different folks. In addition to the yellow Star of David for Jews, there was a red triangle – political prisoners: social democrats, liberals, socialists, communists, anarchists, gentiles who assisted Jews; trade unionists and Freemasons.
Green triangle – convicts and criminals (often working as kapos).
Blue triangle – foreign forced laborers and emigrants. And of course, pink triangles for homosexuals and deviants.