Hello, no extra cost for customize costumes. Please simply select the 'custom size'and fill up your exact body size (or the costume size you want it be) , and our tailor will make your costume size as required. 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).