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Difference between a suit and tuxedo

The tuxedo is a formal garment. It features some details, that suit doesn’t have.
Buttons – The buttons of a tuxedo are usually covered in satin. Suits don’t incorporate satin and usually have either plastic buttons.
Lapel – The lapel or collar on the tuxedo jacket is accented with satin or another fabric detail. Sometimes the entire lapel is made of satin, other times it is accented with a fabric trim or ribbon detail. The lapel on a suit jacket matches the fabric of the suit. The style of the lapel can shawl, peak or notch lapel.
Shirt - Tuxedo shirts have pleated front and can be worn with cuff links and studs. These shirt can be made with buttons and with buttonholes only (for studs). Tuxedo shirt are white.
Pants – Tuxedo pants feature a thin satin strip down the outer leg of the pant. It can have one pleat, two pleats or no pleat.
Accessories – Cufflinks and button studs are usually worn with a tuxedo. Tuxedos are traditionally worn with bow ties and a vest or cummerbund (made of the same satin fabric that you can see on the lapel.), while suits are traditionally worn with a long tie, alone or with a matching vest. That’s not to say you can’t wear a bow tie with a suit or a long tie with a tuxedo, however. It’s just that wearing a tuxedo with a bow tie is more common and traditional.
Tuxedos should be worn with shiny patent shoes only.
Luke Evans wearing a tuxedo
Luke Evans wearing a tuxedo

A suit can be formal too, but not as much as a tuxedo.
Buttons – The buttons are made of plastic and the buttons color is similar to the suit’s fabric.
Lapel – Usually made of the suit’s fabric. There lapels can be peak or notch lapel. Shawl lapel is very rare on suits.
Shirt – The shirt can be hidden buttoned, pleated (dress shirts) or seamless (fancy shirt). The shirt can be in any color, even patterned. The shirt cuffs can be made with buttons or only with buttonholes for cufflinks.
Pants – Made from the same fabric as the jacket. It can have one pleat, two pleats or no pleat. These pants doesn’t have a satin stripe.
Accessories – Cufflinks, ties, pocket squares, matching vest, simple leather or Oxford shoes, leather belt matching to the shoes. Leather notebook bag or the simple briefcase.
Luke Evans wearing a suit
Luke Evans wearing a suit