Lovely vintage nightgown by Lorraine. Marked size is Medium. Measures approximately 53" long x 20" pit to pit. 
No stains. The seam's stitching has come apart under the right arm and near the bottom hem. (Last 2 photos)
This is vintage and pre-owned. Please excuse other imperfections that may have been overlooked. 
Any questions, please ask! Thanks for looking!