LOVE that second one of yours waterlane
But I am big into 60's/70's styling anyway
That sounds fairly formal op. Big do? Lots of planning gone into it?
If you're usually in black I can understand why you're having difficulty. I'm guessing these aren't you're usual styles too?
Navy and cream is a classic combo that skirts the black faux pas while not taking you too far out of your comfort zone or even a dark chocolate brown and cream combo.
What kind of style do you usually wear?
Let me go browse you're preferred retailers which I'll admit I'm not familiar with all of them and see what I spot