Rule No. 9:
The spring 2014 runways saw designers from Fendi to Ermenegildo Zegna play around with black tie, incorporating silk scarves, close-fitting cardigans, and even henleys. Don't be afraid to do the same.

Left: Dior.
Right: Ermenegildo Zegna.

Rule No. 10:
A one-of-a-kind accessory can be a cornerstone of your off-the-clock uniform. Whether it's a slim Saint Laurent belt, a Lanvin cashmere-cotton scarf, or a sartorial watch strap, find something you love and wear it with everything.

Rule No. 11:
If you don't want to go full-on tux, opt for slim-cut black jeans instead. They perfectly embody dressed-up, laid-back confidence, and there's nothing they don't look good with.

Rule No. 12:
Doing undone black tie right means keeping the key pieces monochromatic, like choosing a slim-cut, dark-blue T-shirt instead of a white one. Add sleek sneakers and take on the night.

Suit ($2,490) and Shirt ($350) by Fendi. Shoes ($275) by HUGO.

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