Tuxedo or not? Who chooses his attire?
The Groom’s Tuxedo
Your fiancé should have a say in his outfit! You should naturally have a say in what your fiancé chooses to wear for the wedding, but the ultimate decision should be up to him. 
The best thing you can do is to take a trip to a mens wear tuxedo rental shop and have a look around together.
Have him try on some suits and ask him about which ones he likes. You can attempt to coordinate his suit with your dress, but if he absolutely falls in love with the idea of wearing an Ascot while you are dressed in an understated gown then you may just have to accept the fact that you don’t necessarily mesh in a fashion sense. As long as you mesh in a relational way then you’re doing just fine.
Although in many cultures it is regarded as bad luck for the groom to see the bride in her wedding dress prior to the wedding there is no reason why the "bride to be" should not be involved in choosing his wedding clothes. Many girls say they have better taste than him so need to be involved but I am not getting involved in that argument. There is something to be said for having a sensible common theme after all those wedding photos will be on display for a lot of years.
Do you want him to color coordinate with your Wedding Dress?
If you remember back to your high school /college days you may recall that oftentimes the boys would wear cummerbunds and ties which were the same color as their dates’ dresses. Other boys would wear suits which matched the color of their date’s gowns perfectly. Although this is a cute look, you should not feel compelled to do this unless you find it ideal.
If your fiancé chooses to wear a simple black suit then you can always add a boutonnière of a similar color to your wedding color themes, whatever those might be.
There are more options than the traditional tuxedo.
Just as you have endless options when picking out your wedding gown, your fiancé will be faced with many different choices as well. There are many different styles to tuxedos and many different colors too.
Maybe your fiancé has always wanted to wear a zoot suit. Perhaps he envisions getting married while wearing a white tuxedo jacket instead of the classic black. He might even want to sport a suit with tails, a hat, and a cane.
If your fiancé wants to personalize the outfit he wears on the day of the wedding then you should encourage him and be glad you have a fiancé who has some individual style…so long as he is not trying to get married in ripped jeans and a tank top while you are standing there is a formal gown and veil.
However be aware that fashions can date very quickly as can your own private taste in clothing. I know a couple who got married in full teddy-boy outfits back in the early 1960’s and then some twenty years later felt embarrassed and had the photos taken again in "more traditional" clothing using digital photography to place the original young faces on the new photos.
As a Scot based in north east Scotland I wore a full Highland Kilt outfit for my wedding so you are not necessarily tied to wearing a suit. I will add a photo later or even do a whole section on Romantic Weddings with a Scottish theme. Just think how many big stars are choosing to get wed in Scottish castles!
