You've just found yourself in a situation where someone is requiring of you to wear a black suit at his wedding. Sooner or later some one else is going to get married and you may need to wear a black suit yet again. If not, then some one is going to die and you'll need to show up at a funeral where everyone is wearing black, crying and eyeaballing those who aren't showing proper respect and compassion for the deceased and their loved ones...god forbid you show in inappropriate dress driving the widow and family members into hysterics......"after all we've done for him, and he can't even come to so and so's funeral wearing a black suit! Everyone else wore black, but not him....he was always all about himself, so self absorbed...I always did find him hard to tolerate, so insenstve and constantly putting on airs!....blah, blah blah!"
It sounds to me like you're in need of a black suit. You are most likely going to need to wear one again. Now go buy a damn black suit.