What if the maximum insurance doesn't cover the sale?
Some carriers have a maximum value they will insure your package for.
If your carrier can't cover the sale value of your dress, consider using a different carrier that will. International carriers such as DHL or FedEx usually don't have a cap on insurance cover, but may be more expensive. Another option is to go through a third-party shipping insurance company.
Remember, if the dress is lost or damaged in transit, the buyer will receive a refund, so it's always important to pay for insurance.