I made a holder out of a sheet of plastic and a small plastic pipe. There's a piece on the back of the binoculars that sticks out like a "V." I cut the side of a pipe off just enough so the "V" piece would slide in. I glued a bit of plastic to the bottom of the pipe so the binoculars wouldn't slide all the way through and fall out. I then glued the back of the pipe to a larger square of plastic and riveted that to my pleather wrap that goes around my boot. You can get the plastic and pipe from Home Depot. The pleather and rivets I got from Joanne Fabrics. Although Michael's Art and Crafts has better prices and a better selection of rivets.
Note: My setup worked great, except one rocket did pop out while I was walking. I recommend gluing the rockets in, just in case.
If using the binoculars, I also recommend cutting off the middle piece that swivels between the actual binoculars. Warning: this is hard to do with an exacto knife! There was a piece inside the piece I was cutting off. I highly recommend using a dremel, and don't plan on slicing all the way through, just go around the edge. Also, once this piece is removed, there's something inside that rattles. If you look in the space above the "V" piece on the back, you'll see what's rattling. I put a wad of sticky tack in it, and solved the rattling problem.
You would think with the popularity of the movie in grand proportions one would know the character even if you didn't watch the movie. Yeah go get the helmet and take your time in painting and adding the small details. I made a detailed list on my Star-Lord builds 
