Hello JIE YIN WONG, we provide both standard size and custom size.
1) For standard size chart, please check the "Size Chart" under the product photos.
2) If the standard size doesn't fit you, you can 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).