Hello Hazel, yes, normally, you don't need to pay extra cost for the costum size, but if your size is so big, you need to pay extra cost. The processing time is about 13-17 business days. 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).