long black formal dress Shops Inc Stretchy Formal Evening Gown 18, Women's occasion dresses in plus sizes and La Femme long designer dresses for formals Black Tulle High Slit Pageant

The model (height 5'8) is wearing a size 2XL Package

Its just one level below white tie, which is the most formal dress code of all

XS size Height: 61"-63" Chest: 32"-33" Waist: 24"-25" Hip: 34.5"-35.5" S size Height: 63"-65" Chest: 34"-35" Waist: 26"-27" Hip: 36.5"-37.5" M size Height: 65"-67" Chest: 36"-37" Waist: 28"-29" Hip: 38.5"-39.5" L size Height: 65"-67" Chest: 38.5"-40" Waist: 30.5"-32" Hip: 41"-42.5" XL size Height: 65"-67" Chest: 41.5"-43" Waist: 33.5"-35" Hip: 44"-45.5" 2XL size Height: 67"-69" Chest: 46"-48" Waist: 39"-41" Hip: 48"-50" 3XL size Height: 68"-70" Chest: 50"-52" Waist: 43"-45" Hip: 52"-54" Note: 1

Taylor Swift rung in her 32nd birthday on Monday, December 13, in a gold sequin gown