Sizes for this dress are Small to XL (similar to 54-60)
However because of the material the dress is more fitted so If you traditionally wear a 56 (in this dress a M) go a size up to 58 (size L) unless you’re slim, then you can stick to the reg size.
Model is wearing size Medium
During BFCM (Black Friday/Cyber Monday) all items sold are FINAL SALE