Relax. There are no hard and fast rules you have to follow anymore when it comes time for you and your groom to coordinate your look. Only that the bride and groom’s look should be in simpatico. This means if you're in a Reem Acra with a cathedral train and veil, the groom can’t show up in a casual linen suit without setting your unity as a couple off-balance. Realize this day is symbolic; you’re creating the harmony you hope follows the rest of your life.
If you happen to like tradition and want to follow the rules to the letter, below you’ll find them outlined; on the other hand, if you wish to add a twist on those traditions to demonstrate your creativity or make a statement, go for it.
HIGH DRESS FORMAL - Pictured above. Generally when the bride is in a formal gown with a long train and corresponding veil after 4PM, the groom is in white-tie and tails. Think symphony conductor in full dress and you’ve nailed this look. The overcoat is black and can be single or double breasted. Shorter in front, it narrows down to two tails hanging to the knees in back. Typically a white pique shirt and white vest are worn underneath with white bow tie. White gloves and a pocket silk or boutonniere really complete your appearance. So what if you want to go white tie before 4PM? As long as the bride’s gown is formal enough and you both feel better in full dress at noon, do it. 
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Vera WangFORMAL- Both photos above. Time of day (11AM-4PM), location and size of the guest list usually distinguish this from the High Dress Formal wedding. The bride wears a gown with a train and the groom is usually in a tuxedo. Single or double-breasted, the tux is worn for formal and semi-formal weddings with matching trousers that have a satin stripe running down the outside leg. Under the jacket is a wing tip or spread collared shirt, vest or cummerbund and bow tie. Contemporary versions with vests can be worn with necktie replacing bow tie. An alternative to the tux is the traditional morning coat, once standard for formal daytime weddings. To picture this look think Ascot. You know those races in England with all the guys in top hats? Like tails, this coat is short in front, tapering to a long split panel in back. Can be in black, but gray is the traditional shade. The coat is worn with corresponding gray or gray pinstripe trousers, a gray vest and white spread collared or wing-tip shirt, topped off with an ascot tie.
Cavalli
Ulrich EnglerSEMI-FORMAL - Pictured above and below, typically the bride is still in a formal gown, only she dons a shorter train or ball gown sans the train. This less traditional wedding gives you both the flexibility to tone down the formality of your attire. Here your groom can go with a different shade or unconventional cut tux like a Nehru jacket. During summer months, how about a white dinner jacket with black trousers, matching cummerbund and tie? This Humphrey Bogart in Casablanca look is great for West Coast or island weddings—compliments beachy/evening gown silhouettes so trendy now.
Le Spose di Jo
INFORMAL-For an informal wedding your groom can wear anything stylish from his best suit to something more laid-back like a navy sport coat or silk shirt and khakis. Clothing here follows the simplicity of the celebration, and one of the most important things you and your groom need keep in mind is, informal weddings are brief and the attire though stylish and even elegant, is never formal.
