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I'm not sure if the picture quality is great or not or if I know the sizing but I uploaded this from mobile so I don't know. Well I guess I should just list the steps on making the bracers.

[PS: This is very similar to making a breastplate I know, but since the bracers on dauntless Ahri are so large, I'm gonna use the pieces to warp some craft foam/card board and use some expanding foam to carve from.)

1- Wrap the plastic wrap around your arm.
2- Take small strips of tape and cover the entity of the plastic wrap, once you're done that you use some scissors and cut the piece off your arm. I know this is VERY DANGEROUS but I did this, what I suggest is your cover only the top parts with the tape and rip the plastic wrap off of your arm with the area that isn't covered in tape.
3- use a permanent marker to shape the bracer the way it's naturally going to rest on your arm and cut where you've drawn onto.