Groom Style: Necktie Glossary

ASCOT
A wide scarf crossed in front and secured with a stickpin. It's a very formal look that you don't see much these days.

BOW TIE
This is the classic formalwear neckwear. The bow tie coordinates with a cummerbund or waistcoat. While a pre-tied bow tie was OK for the prom, the hand-tied version is more appropriate for the big day.

FOUR-IN-HAND TIE
This is the familiar tie that's worn with a suit, in a dressier fabric. These days, a black four-in-hand tie is a popular option, but ties come in many colors and patterns.
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Groom Style: Tuxedo Glossary

CUTAWAY COAT
This is a very formal daytime option, also called a morning suit. The jacket has one single button and a wide, long back tail that ends at about the knee. The cutaway is worn with striped trousers and usually an ascot.

DINNER JACKET
This is really another word for a tuxedo jacket, but these days it is usually used to refer to a white jacket that is cut like a tuxedo. The white dinner jacket looks dashing in warm weather, paired with black formal trousers.

DOUBLE-BREASTED
This style has two sets of buttons down the front. This jacket can't be worn unbuttoned, often making it a less popular choice.

NOTCH LAPEL
The lapels on this most common style of coat have a subtle inward notch at the point where the collar and the lapels meet.

PEAK LAPEL
This is a more pronounced style of the notch lapel: The lapels extend in a point on the chest.

SHAWL COLLAR
The collar on this jacket subtly curves around the neck and down the jacket.

SINGLE-BREASTED
This style has one set of buttons on the front of the jacket and suits most men.

STROLLER
A more subtle version of the cutaway-style coat with a shorter tail in the back.

TAILCOAT
The front of this jacket is cut away at the hips, with long tails extending down the back. This style is considered highly formal evening attire.

TUXEDO
The traditional black or gray jacket with satin lapels, worn with black dress trousers that have a satin stripe along the seam. The tuxedo is appropriate as formal evening attire and is available in a variety of styles and cuts.
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Groom Style: Accessories Glossary

BUTTON COVER
A decoration worn over the top shirt button, usually with a mandarin-style collar.

CUFF LINKS
An ornamental device that fits through the buttonholes on the cuffs of a French-cuffed shirt to hold the cuff together.

CUMMERBUND
A wide satin band worn around the waist with a tuxedo. The cummerbund usually matches the bow tie.

BRACES
Braces are what suspenders are called in the world of formalwear. Belts are almost never worn with formalwear.

WAISTCOAT
The vest that is worn under the formal coat. It covers the beltline of the trousers. The waistcoat has become a popular option, and the variety of colors and fabrics available make it a great way to personalize the ensemble.
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Groom Style: Shirt Glossary

FRENCH CUFFS
These cuffs do not have buttons but are folded back and fastened with cuff links. Almost all men's formalwear requires a French-cuffed shirt.

MANDARIN COLLAR
A trendy option, this shirt collar consists of a simple band around the neck with no lapels. A tie isn't worn with a mandarin collar, also called a band collar, but the top button gets a button cover.

WINGED COLLAR
Also called a stand-up collar, this is a very formal shirt collar that bands around the neck with the points of the collar folded down in the front.

SPREAD COLLAR
The band on this collar sits up higher on the neck and spreads wider in the front than a regular shirt collar. {Source}