Seems like this rule is clearly printed in the How To Be A Human Handbook , and yet I still see at least one white or white-adjacent dress at nearly every wedding I attend, so here we are
The whole point is that under the lighting conditions in the photo, people can perceive either black and blue or gold and white, and neither is necessarily more correct than the other, because of the Purkinje effect.

Vendors More Photos From This Album Bruna and Pat Beach Wedding at The Cape Club Bride in Strapless, Ball Gown Wedding Dress with Mid-Length Veil Beach Wedding Ceremony on Old Silver Beach Aqua and Tan Beach Wedding Party White and Gray Table Number with Starfish Accent Wedding Reception at The Cape Club in East Falmouth, Massachusetts Strapless Wedding Dress with Ball Gown Silhouette Pink Rose and Hydrangea Bouquet with Dusty Miller Bruna and Pat First Kiss Bride and Groom on Old Silver Beach DIY Advice Cards in Glass Bottle Bruna and Pat First Dance Aqua Blue and White Wedding Invitation Wedding Recessional on Old Silver Beach Aqua Bridesmaid Dresses with Pink Bouquets Beach-Inspired Place Cards with Starfish Detail Aqua and White Dining Table with Candle Centerpiece Beach-Inspired Wedding Cake with Beach Chair Cake Topper
The Olympia is a Concert Black dress made in our wrinkle-free Crepe
13 Zara Midi Dresses That Are at the Top of Our Shopping Wishlist For Fall Not quite floor length but definitely above the ankle, the midi dress is a sartorial sweet spot for those looking to move around comfortably and with flair
This, my dear, is the maxi dress of your dreams