Got tired of my pants getting dirty from my chain, so I made my own leg straps.
Step 1: Acquire Supplies
I bought a yard of reflective fabric from a fabric store for 4 dollars, velcro from Walmart, and a sewing machine from a dumpster a few years ago. (sewing machine is optional)
You'll need scissors too
Step 2: Cut Fabric
Cut the fabric to a suitable length, this varies by calf size. Cut a square of velcro and put it on opposing sides (on the ends) of the fabric.
Step 3: Sewing
I would suggest sewing the velcro to the fabric, it will keep the sticky from wearing off of the velcro.
Step 4: Now Go, and Don't Get Run Over.