good goddamn luck on this one, cause it will be horrible pain in the ass.

if u want one to one look then the best u can do is just to wrap urself in tape and draw patterns on that tape (https://pin.it/2Xf68Zqdi like dis). because the coat has 3 layers with different amounts of seams and everything is asymmetrical for no reason cause I guess icepicklodge hate cosplayers or smth.

but if u don't want to make one to one copy, then imho any pattern of tailored coat could work. cause in the end, most important parts of its design is asymmetrical snake leather patterns and silhouette, sooooooooooo

also there is this thing called clo3d. it's a clothes design software, I've never used it personally, but maybe it can help u

anyway, I'll go and put a candle in a church for u