Vintage formal dress, ball gown, prom

There is an old lady who lives in my apartment building who asked me to sell some dresses for her and I couldn't say no. She does not know the brand or anything and says the size is S/M. I know it's hard to work with that info but if you are serious about buying it, I will personally go and measure everything out. This is a beautiful vintage blood-orange gown for fancy occasions and celebrations. There is no proof of wear and tear anywhere on the item. Questions? Ask. Price is hers