Does black-tie always mean a tuxedo?

Yes, when black-tie is specified a tuxedo is a must. Black-tie events are formal occasions. When an invitation specifies black-tie optional a dark suit or tuxedo is acceptable. A classic tuxedo outfit includes a white dress shirt, a bow tie, dress pants, a tuxedo suit jacket, leather dress shoes, and a vest or cummerbund. Tuxedos are worn on formal occasions such as formal weddings, balls, dances or fancy parties.

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The Perfect Investment Suit for a Man
The best investment suit for a man is a single-breasted, navy blue, 2 button, lightweight wool suit. Perfect for wedding guests, some formal events, funerals and memorials.

Wear the jacket and trousers separately. The trousers look awesome with a sweater or sport jacket. The jacket can be worn with chinos or jeans or tailored slacks in gray, white, beige or a color.

An investment suit is a classic will pay future dividends since it will never go out of style.

How to Dress for a Wedding: Men’s Suiting Guide
When it comes to dressing for a wedding, there can be a lot of stress that goes into the final outfit decision. Is what you chose too dressy? Not dressy enough? There is so much to be mindful of that it can become a bit overwhelming and sometimes even make you not want to go at all.