Off-Shoulder Floral Accented Romper

This was purchased from a boutique in Long Island NY - marked as size Large but runs small (the model used in the photo is a size small - the item fits like a size medium). This item has never been worn other than to try it on or to model for the photo shown here. This item does not have any tags that indicate the type of material it is made of but it is soft and flowy.