Start off by drawing out the buttons on your camera. I didn't try to make my ones look perfect because I wanted them to look a bit cartoony. Feel free to use my ones (<- click to get them big)
Take the fabric and cut out a basic t-shirt shape. The drawing shows something similar to the one I cut (sorry it's a bit rubbish).
Stitch together your t-shirt and lay it down on a hard surface.
Print out your camera buttons on to transfer paper.
Cut each button out carefully, making sure not to cut in to the paper remnants too much.
Lay the cut-out remnant on top of the t-shirt in the position you would like to buttons to go,
Remove the transfer backing from the remnants and place in to the appropriate hole on the cut out.
Remove the cut out, making sure not to move the buttons and place the wax paper on top.
Carefully iron the buttons in to place and you're all done!