well first off would be to get quite a bit of money ready, they arent cheap. Then, if you were gonna get it made for you, you would have to choose where from, theres a few good places that make them.
Kanakig
Leigh got hers from here, the mask maker is very freindly and helpful, Ild highly recomend him. He can also get the bodysuit done too for you.
apart from those things, the only other thing you need is a passion for it. As you might have seen, early photos of Leigh werent as happily accepted by others on here
Good luck in getting your Kig, always nice to have more in the world ^^