This is a template/decal for the VOX/PTT switch boxes used by Naked Snake and The Boss in Metal Gear Solid 3: Snake Eater.
While the dimensions are based on the in-game render (using the STABO harness' width as a reference), I did take a few creative liberties by adding the FOX seal and the "VOX/PTT" text on the rear plate.
Just download the full-size image and print it out as a 4x6 either at home or your local print shop. The finished switch box should be 2.25" x 3.0".
Feel free to use this image for your Naked Snake or The Boss costume, but please remember to give credit where credit is due.
TRIVIA: The throat mic that connects to the finished switch box is a WWII Western Electric D173077 model.