Hey people I only have a few days left here so I am BEGING for your help!

I know we have all thought long and hard about this idea...I hope.

How sould I go about making a harness to go under my clothing so I can have it look like I have swords going through my back and out the other side?
I thought about using my mothers backbrace, but it is kinda big and I am kinda small... plus I am strapped for cash. Any suggestions?