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When it comes to dresses, you'll want to stick to darker colors like navy blue and black

The duo adds a touch of casualness to wear while maintaining class and style

If someone was in doubt as to what was appropriate, they could consult the Cassells Household Guide

When it comes to maintaining the black tie dress code class, but at a slightly more casual level, our top tip is to look for a more modern style (read: materials, design and shape) and steer clear of the classic, luxurious materials that dictate an evening black tie affair

Long sleeves are a no-brainer for a cold weather ceremony, as are maxi hemlines and high necklines