Long black dress w/tie belt

I’m selling this for my sister, who purchased new from Zelie for She and never wore it. It includes a matching tie belt. Although it is NWOT, there is considerable fraying/loose threads around the collar and a couple smaller loose threads on the sleeves. These could probably be trimmed off. I could not find care or material tags and looked on Zelie for She website without success so unfortunately do not have additional info. Measurements will gladly be provided by request and offers are welcome!! Happy shopping. 😃