OK, so you’re a guy who’s about to get married.

Nobody has to tell you that you have absolutely no say in anything pertaining to the wedding. It’s the bride’s day.

So the least you can do is choose the right tux.

Here are three things you should consider when choosing a tuxedo for a wedding – or any formal event.

First, make sure the style fits the occasion. You probably don’t want to don a Humphrey Bogart “Casablanca” jacket while taking your sacred vows.

You’re better off going for the traditional black or gray cutaway with a single button at the waist, and a broad tail in the back. Classy.

Next, consider the lapel. If you’re the big and buff type, try wearing the rounded shawl collar that rolls back in a continuing, tapering line for a flattering look.

Skinnier guys may want to go for the V-shaped notch lapel that accentuates the horizontal. A lot of dudes like the classic peaked lapel, with two points of fabric going up on either side.

Finally – make sure it fits. This is not the day to split your undersized pants, or wear some oversized mess that makes you look like a boy in a man’s suit.

The sleeves should touch the tops of your hands, and the shirt cuffs should hang no more than a half-inch from the jacket sleeves. And the pants should skim the heels of your shoes.

And for heaven’s sake – don’t wear a tux she doesn’t like!