Halloween // I need help finding the best way to get a good costume for this year!

So my girlfriend wants the friend group to dress up as characters from LoL Arcane. I have been assigned Jayce Talis. I would like to dress as arcane survivor Jayce specifically. What would be the best way to get a good costume? Any recommendations for sites, or artist? Maybe the best bet is me making it myself? Any advice would be great!