Pre-owned and vintage, yet looks amazing!  Vibrant shade of yellow, no fade at all that I can see.  There is no size tag, I called it medium based upon the measurements, shown in photos, but if you need any other photos or measurements, just let me know.  Nothing to identify material, but feels just like that lightweight polyester that was popular in the 60s.  There is a small tag underneath the tag that says "Motherhood First in Fashion," but I can't make it out at all since it has faded so much.  I took two pics of it, just in case you have very good eyes and can read what it says.  What's neat about this dress is I think it could really work for a non-pregnant person as well, since it has that tie.