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Unlike cocktail attire or semi-formal, which leave significant room for interpretation, black tie dresses have a standard that has been consistent across decades and across every type of formal occasion that carries the designation

A Swiss dot modest black midi dress fits the bill

Your two options would be to create a monochromatic look, or each of the colors be different but still create a beautiful appearance

MESHKI | Luxury Fashion & Lifestyle Inspiration Champagne Maxi Silk Dress Bridesmaid Dress Open Back Satin Dress Wedding Guest Dress Size Chart - Women Bust: XS: 80-84 cm / 31.5-33.1 in S: 84-88 cm / 33.1-34.6 in M: 88-94 cm / 34.6-37.0 in L: 94-100 cm / 37.0-39.4 in XL: 100-106 cm / 39.4-41.7 in 2XL: 106-112 cm / 41.7-44.1 in Waist: XS: 62-66 cm / 24.4-26.0 in S: 66-70 cm / 26.0-27.6 in M: 70-76 cm / 27.6-29.9 in L: 76-82 cm / 29.9-32.3 in XL: 82-88 cm / 32.3-34.6 in 2XL: 88-94 cm / 34.6-37.0 in Hips: XS: 88-92 cm / 34.6-36.2 in S: 92-96 cm / 36.2-37.8 in M: 96-102 cm / 37.8-40.2 in L: 102-108 cm / 40.2-42.5 in XL