Debbie, i can't TELL you how many times i've seen modern merchandise in antique shops ~ it makes me crazy.
we've handled some crocheted dresses, as well; it seems the ones that are tone on tone, like this gorgeous gold on gold, may have been dyed together for a consistent color. having said that, this could be from Bali, last week, or Bali 20 years ago ~ except for the neckline cut, it is quite similar to one we had about a year ago, or so.
does it feel like rayon? or a cotton? (looks kind of rayon-y, to me...)
I would be hesitant to sell this as vintage ~ however, it is a very desirable summer look ~ and easy for those skinny little girls to wear, dressed up with heels, or thrown on over a swimsuit.