I have seen two brands of popular over-the-shoulder slings to carry a camera on the hip, to allow for any easy transfer of camera-to-eye. I do not like the one that attaches to the tripod screw-in point on the camera bottom, because it makes for a cumbersome transfer to a tripod.
Just, google "Swivel Hooks for a 1 1/2" Strap", "1 1/2 Triglides", "1 1/2" webbing" (5.5' is plenty) and you can be well on you way to making one for well under $50 for a pro model. (eg. c. $5) No sewing is necessary. You can figure out how to attach it to your camera with just a key ring, too. (I got all that was needed at a local REI)