When it comes to plaids in anime, you really have to just bite the bullet and pick something similar. You're usually not going to find something perfect. Any red and black plaid that looks somewhat similar should be fine.
I generally don't recommend buying pre-made cosplays online due to quality issues, but if that is what you want, I found this one just by typing in the series name really fast...
I take no responsibility on the quality or reliability of the ebay seller; you'll have to do the research yourself, but I figured that this was a start for you.
This was found on the first page of Google results just by typing in the series name and the word cosplay, so in the future you should be able to find things like this pretty easily on your own. I hope this helps.