Black hat

Question

This board clears up a lot of misinformation, thank you. "Followers" of Rabbi Abady i found, often misquote your father and misunderstand what he say's even through this media. Case in point, my friend said here, the Rabbi said it was issur to wear a black hat. That was his interpretation to your lenghly answer. Question, is it issur to wear a black hat, while praying or in the street?