Oh, goodness! I was just about to write that you should wear the jacket over something uber feminine like your gorgeous wedding dress!
To bring the jacket into today's styling range, it needs high juxtaposition. See Clare Hornby's first outfit with the ruffled dress and blazer:
https://www.meandem.com/us/the.....8c2_7405_1
You might also pair the blazer with something uber casual, such as these jumpsuits:
https://www.nordstromrack.com/.....o_shopping
https://www.amazon.com/Donna-M.....CT9LB?th=1
I totally get the dilemma. In your shoes, I find myself wanting to wear the treasured piece against not wanting to buy something new to make it work. Do hang on to it if you are not sure yet. What is the cost of that?