A dark blue tuxedo suit can be an elegant and sophisticated choice for formal events or special occasions. Here's a description of what it typically includes:

• Jacket: The jacket of a dark blue tuxedo suit is usually single-breasted, with a satin or silk lapel that contrasts the darker color. It may have a peak, shawl, or notch lapel style, depending on personal preference. The jacket should be well-tailored to fit the wearer's body properly.
• Trousers: The trousers of the tuxedo suit are typically matching dark blue and have a satin or silk stripe running down the side of each leg, adding a touch of elegance to the overall look. They are usually flat-front or have a single pleat for a sleek appearance.
• Shirt: A crisp white formal dress shirt is the classic choice to wear with a dark blue tuxedo suit. It should have a wing or turndown collar to accommodate a bow tie.
• Bow Tie: A black or midnight blue bow tie complements the dark blue tuxedo suit perfectly. You may opt for a classic self-tie bow tie or a pre-tied one for convenience.
• Waistcoat/Vest (optional): If you want to add extra style and formality, a matching dark blue waistcoat or vest can be worn underneath the jacket. It is an optional piece that can elevate the overall look.
• Cufflinks and Studs: To fasten the shirt cuffs and front, respectively, cufflinks and shirt studs in silver or gold tones are commonly used. They add a touch of sophistication to the outfit.
• Pocket Square: A white pocket square neatly folded and peeking out of the jacket's breast pocket can add a final touch of elegance.
• Shoes: Black patent leather or highly polished black dress shoes are the best footwear choices for a dark blue tuxedo suit.

When wearing a dark blue tuxedo suit, remember to ensure proper fit and tailoring, as this is crucial for a polished and dashing appearance. Additionally, keep the occasion in mind when selecting accessories, as some events might have specific dress code requirements.