(1)I can see "Custom size(Inch)", under "size", please tick it.
(2)If I can't see the , how to pay?
(1) Add your item(s) to cart
click "add to cart"
(2) Proceed to Checkout
click " checkout "
(3) Fill in all the forms and write "custom size" in step 5
write your "make you own costume" requirement on in step 5.