Burn the black suit would be a good start. Horrendous colour to have in your wardrobe. Then get a few suit and appropriate silk tie/pocket square and tie.
NB square and tie should not be from the same piece of silk.
You are not going to a funeral so forget any ideas of wearing a black suit. Unless you are a regular at funerals or an undertaker, burn it both for being a Boss and its colour.
Suggest you buy another RTW to replace this rag after the fire.