60s Pale Mint Green Lace Sleeve Party Dress - Union made 1960s (tag in skirt portion) by Lee Claire New York - dress company which specialized in better cocktail, dinner and evening dresses.
Sold AS IS - see all photos - some thin yellow discolorations have appeared in lower half of front part of dress. There are two pen tip size holes on lower side of dress. There are some brown specks on front bodice and slight wear (fuzz) on bodice. All this is best seen in natural light, indoors it will not show too badly. Back nylon zipper. No materials indicated but to my eye looks like silk.
No size tag, model is 5'10" US S/4, mannequin is 5'8" XS. See dress measurements and compare to similar nonstretch shift dress:
19. 5" underarm to underarm, doubles to approx 38" bust, 19" across waist, 20" across hips, 38. 5" long, 16" across shoulders, 21. 5" sleeve from shoulder.

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