Rated: Slightly difficult, worth the time
Materials needed: A highchair, an unused banner destined for the garbage can, needle and thread and/or sewing machine, and about two hours of time to kill
When sewing the vinyl edges together, take time to make sure that you are sewing the backside together. I messed up and had to take my thread out and redo it. The idea is that by sewing it inside out, that when you flip it right side out that the lines are super clean with no visible thread. I recommend reinforcing the thread by making a couple passes through the sewing machine, especially in the corners.
So this is what the put together pieces would look like. There is ONE piece not sewed shut, if you sew it shut, you won’t be able to get your cushion in!! :D Luckily this did not happen to me but it was definitely a possibility.