Formal Wear

For black ties, weddings and Christmas parties, our formal trousers and waistcoats are expertly crafted and meticulously cut. Shop our new Single-Breasted and Double-Breasted Waistcoats, featuring a sprightly William Morris print on the reverse. Getting married? We’ll even give you 5% off if you buy 5 waistcoats, or 10% off if you buy 10.


Take a look at our wedding lookbook, and let Sir Plus dress you and your groomsmen. We’ve been making waistcoats since 2011, and we’ve worked hard to achieve the perfect fit. Our latest range runs the gamut from classic grey to bold azure, giving you plenty of options for your special day.

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