Fantastic Mid-Century Bleeker Street Dress

Stunning vintage dress with a daisy design. Playful yellow block on one side of the dress with the zipper following the yellow fabric on the back (off-center). Adorable applicated daisies and there is one front pocket. No size listed. Measurements are of the bust, waist, hips, and overall length. Condition issues: The wrinkles on the front of the dress are from the hanger, not a permanent concern. There are a couple of stains on the back of the dress. I have tried regular soap to remove them but they appear to be rust (or blood?) and did not come out. See photos for the stain. It's only on the left, back shoulder area.