Here are the materials you need to make it happen:
-iron
-sewing machine
-straight pins
-scissors
-approximately 1/4 yard faux suede cord (it's the blue one there)
-embroidery thread
-measuring tape
-approximately 1/4 yard twill tape (or any kind of tie for the top, really: hemp or cotton cord, a few strands of ric-rac, whatever you like)
-two buttons
-1/3 yard fabric. Lots of types will work, but I chose a mid-weight cotton twill (a previous sling in linen was a little light)
-needle
-safety pin (the bigger/sturdier the better)