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Generally your tie should be the same width as your lapel.
So here's a general suit rule: “Your tie at its widest should be the same width as your lapel,” according to Black Lapel. That's because suits all about proportions, and essentially you want everything to look as even and clean as possible.
And you should know the different types of lapels.
Here are a few examples of the different types of lapels. Make sure to heed the widths to help match your tie to your suit.
The sleeves of your suit jacket should stop somewhere around the wrist bone.
Because everything that has to do with a suit is based on proportions, your jacket sleeve coming to your wrist bone is a generally accepted rule. Your tailor probably knows best, but this is just something to keep in mind when getting adjustments.