Hello Tobias Kärnerup, 27cm is about 10.62 inchs, and do you mean you want to order size XL? If so, please simply select the Shoes Size--XL. 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).