Vintage 60s Blue Mod Sleeveless Beautifully Beaded Dress - Union made in USA - Imperial Designs Division of Fred Rothschild - Hand detailed in Hong Kong
Vintage size 16, may fit modern M or L - model is 5'6" with 38" bust. Dress measures 19" across from underarm to underarm when laid flat. Bust of 38" or less. Waist 33". Hips 38", 40" long. 100% polyester with back zipper. I washed this as best I could avoiding the beaded areas and separating detached lining from polyester dress - I would recommend dry cleaning with cleaners who are reliable with beaded items if you desire full cleaning. There is a water spot on the lining's hem where I accidentally got water from the dress on it. You could wash the detached lining by separating it from dress but you could only go so far up as it meets the dress and you'd likely end up with a water line there.
Flaws: see closeups of underarms - very faint yellowing - I avoided this area while cleaning due to beading. Lining is also discolored at underarms.

This item is sold from an excellent, highly rated vintage boutique.