Hello Kelly Van Achte, we will only make costumes after received orders & payments, so if we made the costume size as you ordered, we are sorry that we are unable to accept return for exchange nor return & re-customize, so please measure the body size & make sure you order the correct costume size.
If the standard size costume doesn't fit you, please simply select the 'custom size'and fill up your exact body size, and our tailor will adjust the costume size to fit you. n_n
*Custom size costume doesn't charge extra cost, but the processing time will be longer than standard size costumes; for this costume in custom size, we need about extra 1-2 weeks to make it (excluding the shipping time).