Isa Arfen Maxi Cover Up Dress

Not sure if this is a dress that is missing an under slip or a bea each cover up. Either way it is a gorgeous maxi dress in open weave pattern, slits on both sides, back zip, no fabric tag, bust 34”, length 49” and VG pre owned condition ( there are some loose threads and slight tear around halter are as shown-nothing significant). UK10/US6