Model: @tahneenayar models size 8. Tahnee usually wears size 8.
Emerald Avenue Asym Midi
6, 8, 10 & 12
Although this fabric is stretchy, the dress does feature a side zip. This means if the dress is tried on in a size too small, the zip is vulnerable to damage and the fit is therefore not as flexible as one might imagine from a "stretchy" dress.
Wear your usual size, or if inbetween sizes, the small size is likely fine (eg size 8 for 8/10). Do not size a full size down (eg 10 wearing 8).