Let's face it, tuxedos are boring and uncomfortable.
Show me a groom or groomsmen half-way through a reception who is still completely dressed up, and I'll tell you that you've spent too much time on Photoshop! I've been to more than one wedding throughout my life and I've been a best man and a groomsmen before. By the time the food and first dances were over, I was out of the coat and had the tie dangling around my shoulders with the top buttons of my shirt undone. It's just too much! Let's look at some things that this offbeat groom has looked at for wedding apparel:

I think this is a fantastic ensemble! It's comfortable, yet elegant, with a lot of the fancy trimmings you would see in a somewhat formal occasion. It's comfortable and debonaire without the stuffy tie and stiff, high shirt collar. The jacket can be removed and it will still have some fashion sense. This is what I'm hoping for my wedding.

This would definitely be better for a tropical wedding, but again, it's not constricting at all. It's loose, it's comfortable and it's got stamina. By stamina, I mean that it can be worn for SEVERAL hours without driving the individual completely insane. A simple collared shirt, untucked, with some nice slacks or pants and some comfortable shoes or even sandals/flip-flops.

Now, this might be a bit more theme-ridden, but it follows the same concept as the first picture. A long overcoat or duster that can be removed. In this picture he has a long-sleeved, button up shirt underneath (notice the lack of a tie), and he's wearing some tight, long suede (maybe leather) pants which could use suspenders, but certainly isn't required. Also, some leather boots which should be comfortable to the wearer, of course.
Those are some ideas! I'm interested to see what your thoughts are!