Not wanting to throw out almost six feet of pant legs from my son's hemmed pants I came up with "Pant Leg Hats."
Step 1: Material
What's leftover from his pants are two pieces of 10 inch long by 9.5 inch wide pieces of material. These hats are a bit big for him so they should fit an adult with no problems.
Step 2: Fold & Cut
Fold the material in half. Cut the two corners off. I use my serger so I can round the edges when I sew but if you are going to use a sewing machine you would want to cut rounder edges before sewing.
Step 3: Sew
Turn inside out and sew the two points rounding the edges.
Step 4: Open
Open the hat up and sew the other two points from one edge to the other. I pinned the middle together at the seam.
Step 5: Round the Edges
If you don't round the edges you'll end up with four very pointy points sticking up. I use my serger to sew and cut but a sewing machine would work fine if you cut the edges rounded before sewing.
Step 6: Brim
For a snugger fit you can flip the brim and sew around but this is optional.
Step 7: Finished
My son wearing his Pant Leg Hat, it's still summer here hence the shades and no shirt. :) This one doesn't have the brim sewed.