For quite a while now I've been looking for a solution to the problem of my keys bunching up and tangling at the bottom of my pocket. I've tried carabiners, but those tend to get caught on the edge of my pocket, and having them jangle outside the pocket on a belt loop would drive me crazy.
There's lots of great pocket clips available online, but shipping costs being what they are I needed a stopgap. So I went medieval on a coat hanger with some pliers, and after some trial and much error, I came across a simple yet effective solution that doesn't require specialized tools or skills.
Step 1: Tools and Materials
-Pliers. You'll need two pair. I found that it was really handy to have both a regular and a needle-nose.
-Wire cutters. My pliers have integrated wire cutters.
-File/Sandpaper. If you don't have, you could use any rough, hard surface you don't mind scratching up.
-Hammer. Not absolutely necessary, but could come in handy if your wire is particularly thick or hard.
-Coat hanger. That's it. Any one will do, with any kind of finish. Mine was old and rusty, yours could be new and shiny, but know that it will probably get a bit scratched by the pliers unless you're really careful. Edit: My cousin gave me a good idea to wrap the ends of the pliers in electrical tape. Doing that will avoid scratching, and might make slipping less likely as well.
-Safety glasses. Very important. You don't want a sharp piece of metal flying into your eye.
-Gloves. Also very important. Pinching your skin in pliers could be nasty.
Step 2: Clip the hanger
Step 3: File the ends
A metal file works best, just a few strokes and it will take the point off the soft metal. You'll want to get it nice and round, but it shouldn't take long. Make sure to round out both ends. You will end up cutting the length down quite a bit, but leave it fairly long for now. You can always cut off metal, but adding it requires alchemy, which isn't covered in this instructable.
Step 4: Bend the first loop
Once you have a loop, bend it back so that it extends as straight as you can make it. This will be the free end of the hook.
Step 5: Main bend
There's no set length here, make it as long as you need. I found that 3-5 cm was good.
Step 6: Start the bend of the other loop, cut
File down this end like you did the first to round it out.
Step 7: Complete final loop
Once the loop is formed, bend it into the first loop to make a catch onto the pocket so it won't fall out.
Make sure the two sides are fairly well lined up and straight.
Step 8: Buffing
If the coat hanger had some sort of finish you may want to keep it as-is, but I ended up stonewashing. This took out most of the marks left by the pliers and gave it a nice, grey, corrosion-resistant finish. You could also spraypaint with some high-resistance paint or clear coat. Or if you have any other ideas for finishing, let me know in comments!