Labelled as FR38 so UK10 but because of the stretchy fabric it can fit up to a 12. 
Amazing vintage piece from the French Couture designer. Zip fastenint at the front, decorative pockets. It is not lined so see-through to let the beauty of the lace detail shine through. 
Pit to pit 17 in, length 23 in. 
Great condition.
85% polyamide, 15% elastane.