LOFT Red and Navy Floral Sundress, size 4 but fits like Medium 6-8

Beautiful LOFT sundress, shades of red with navy blue. Size 4 but loose fit, fits more like a Medium or 6/8 in my opinion. Back zipper. Only worn a few times. Stunning in photos. Comes from a cat- and dog-friendly home but items from my Closet are always kept in a separate room.