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^Yeah if you get it from some POS mall tux rental spot. There's good tux rental spots out there. And a navy suit to a black tie event is not a good look, period. Dude will stick out like a sore thumb, in a bad way. If the hosts want black tie, respect them and go black tie appropriate. If you can't for whatever reason, regretfully decline attending. It's that easy.
I don't know of a rental shop that actually provides anyone with a decently tailored tux. There is absolutely nothing wrong with a navy suit paired with a white shirt a dark tie, preferably navy or black and black well shined shoes. Add to the fact that if the fit is on point and which with tailoring can be and will be better than any rental tux. If it is a "true" black tie event like a gala then I would say don't go with a suit but invest in a tux like actually buy one but if I remember correctly it's a wedding, the chances that anyone else is wearing a tux and not on the bridal party are slim.
In short wear the navy suit.