what is casually elegant?

Apologies if I did succeed in posting this a few days ago. I can’t find the thread if I did.
So, I have to attend a function where the invitation says dress “casually elegant”.
Not being a clothes guy, what does that mean for the guy?
sport coat? sport coat + tie? suit?
any guesses?
My wife is OK with what she will be wearing, but I don’t want to miss this mark by too much.


Black slacks and a nice tucked in button down shirt would be my guess.

Here’s your original thread.

I’ll report this duplicate for closure.