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Once you're up-to-date on the etiquette, you'll be ready to buy a mother-of-the-bride dress from one of our favorite online retailers

Quick takeaway: Dark brown bridesmaid dresses are perfect for fall, winter, rustic, boho, or elegant weddings

So business casual is all about hitting that sweet spot in the middle

Best for Formal Rehearsal Dinner Choose a long gown, embellished midi, or refined cocktail dress

While the BTS superstar could've showed up in a shirt, he's switched it out for a rollneck jumper instead, making everything a little more cocktail-friendly

Here are 12 of the most puzzling optical illusions that have gone viral in the past few years, along with some explanations of how they work