Floral dress fancy medium large

Loveshackfancy dupe? I'm not sure because the tags have been clipped out. It's in excellent condition! The person wearing this is 5 6 and wears a small. This dress was big on her so I'm thinking it's a medium or could even fit a large because it's very stretchy around the waist as well as the bust because the entire back portion is stretch material. This dress can definitely fit a larger bust size btw (or not) but the room is there. It's gorgeous. Sold as is. Please understand before purchasing that I do not know the brand due to tags being cut out.