It's a Delicacy Tiered Dress

Fit - True to size 
Material - 100% Rayon
Details - Tiered, gathered ballon sleeve, back keyhole closure, lightweight breathable material
Brand - GeeGee
Model - Pam and Sarah are wearing a size small, Kendall is wearing a size 1XL

S: 0-4
M: 6-8
L: 10-12
1XL: 14-16
2XL: 18-20
3XL: 22-24