Given that the order of this customer is not going to be available until late in the next month, the best thing to do is to notify the customer.
The main reason you have to notify this customer is so that they can make a choice on whether they want a different dress or not.
Shipping a dress that was not their choice may cause an issue. Also, it would help to know if this customer would want a refund or not.
Therefore, the best thing to do is to notify the customer.
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