maxi dress navy blue Satin Slip 55% Rayon / 45% Linen Lining Star Avenue Strapless Drop Waist

Make them eye-catching with tan or white colors and a lace or chiffon dress

Waist: 23.0"

or this simple dress sewing pattern with square neck and flared skirt or the easy to make sundress pattern Method 2

Buy Smileven Jacquard Satin Homecoming Dresses for Teens 2025 Black Short Strapless Formal HOCO Dress A Line Mini Birthday Party Gown US0 and other Cocktail at Amazon.com

And for nearly $500, wed expect a higher wool content (these pants are 53% polyester), though we do love this fabric

I think an OCBD or polo shirt would work better with the level of formality and provide that extra collar (even if the shawl cardigan somewhat mitigates this problem)