To start, when thinking about a winter wedding guest dress, you can't go wrong with velvet, pants, or jewel tones like maroon and emerald green ... about black tie or white tie attire?

She never misses an opportunity to showcase her impeccable sense of style, and Pippa Middleton certainly didn't disappoint at her best friend's wedding ... Emerald Isle by donning a bright green ...

Although her emerald green hue is no longer available to shop ... As for Prince William, 41, he wore a dark suit and white dress shirt as he drove his wife home from the bash.