Hello Kit, thanks for your questions. (n__n)
1. 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).
2. yes, please simply select the 'custom size'and fill up your exact body size, and our tailor will adjust the costume size to fit you.
If you have special request on the sleeves length, dress length, hat size, please also write down them in the Remarks Box when you make the order.
3. Yes, you can order the standard size, and write down the special costume size parts, our tailor will check all the remark size before we start making it.