What black tie actually requires
Black tie means a dinner jacket (tuxedo) in black or midnight navy, with matching dress trousers (with a silk stripe down the outer seam), a white dress shirt with a pleated or piqué front, a black silk bow tie (self-tied, not pre-tied), and black formal shoes (Oxford or opera pump). The full ensemble is specific; substituting a dark suit for the dinner jacket, or wearing a standard shirt rather than a formal dress shirt, communicates that you have chosen not to follow the dress code rather than that you are dressed formally.
At The Black Lapel, black tie commissions are among our most precisely constructed work. The dinner jacket requires specific construction details — working sleeve buttons, a specific lapel construction for the shawl or peak lapel, a particular trouser construction — that differ from a standard suit jacket. These details are part of what makes the black tie outfit read correctly rather than as a very dark suit.
Indian black tie — the bandhgala alternative
At Indian black tie events, a fine bandhgala in black or midnight navy in quality suiting cloth is an accepted alternative to the Western tuxedo. The stand collar construction of the bandhgala is the Indian equivalent of the tuxedo's formal closure — both signal maximum formal intent within their respective traditions. A fully canvassed black bandhgala in quality suiting wool, with silk buttons and a precise fit, reads as Indian black tie in any Indian context.
This alternative is specifically Indian in context: it would not be appropriate at a Western black tie event abroad but is entirely correct at an Indian wedding with a black tie dress code. For Indian clients attending these events, the choice between the Western tuxedo and the Indian bandhgala is a genuine choice between two equally appropriate options, and the decision should be made based on personal identity and comfort rather than any rule of correctness.