long sleeve black silk dress Women's Mock Neck Satin Elegant Elastic High Waist Formal Wedding Cocktail Party Midi (Black, S) : Clothing, Shoes & Jewelry The sleeves are ¾ length and have a shirred cap shoulder and they end in romantic open flounce cuffs Emery Satin Long Sleeve Collared

I thought it was a glitch on H&Ms website but its not

Designed by French-born costume designer Jean Louis, the sheer dress was embellished with more than 6,000 hand-sewn rhinestones and created the illusion that Monroe was wearing almost nothing at all a daring fashion statement that helped cement the "Happy Birthday" moment in pop culture history

If you dont know many of the other attendees, you can also reach out to the couple directly (or someone in their wedding party) to see if theyd be okay with you wearing black to the wedding

However, ensure the belt style matches the formality of the eventa rhinestone belt is perfect for an evening, while a leather belt might be too casual unless it is patent and sleek