I have posted this in the past:
I don’t wear black suits on a daily basis, I wear extremely dark blue or gray. When I first became an attorney and went into court in a Black Yeshivish suit, white shirt and non-descript tie, a friendly older judge asked to see me in chambers. He pointed to his black robe and said that the only one wearing black in the courtroom should be the judge, it is a sign of respect to wear another dark color.
Although, I don’t appear on court most days, I never know when I might have to be there on a few minutes notice, so for decades I dress every day in a dark non-black suit.
My sons grew up seeing what I wear and they wore similar garb. They attended the same yeshivah in Brooklyn that I, my brothers, my father and uncles attended. Some wore Midnight Blue suits as I do, others felt the pressure to wear the ‘cheap black suits’ worn by most of the young men in order to fit in. The one thing that never happened was the Rosh Yeshiva telling any of us we had to wear a black suit.
Edited
That said, the majority of my Shabbos suits in the past 59 years have been black