FASHION MIA NWT BLACK MIDI DRESS

Fashion Mia NWT Black Sheer 3/4 Sleeve V Neck Midi Dress with built in sheer slip. Size Medium Note: The dress has something white that resembles deodorant staining on the INSIDE of the built in slip. Not sure what it is, I can't wash it bc it is NWT so I'm not sure if it comes off or not. It can't be seen while wearing as it is on the underside/inside of the inner slip of the dress. See last photo for reference