I found instructions for this poncho. It's a very simple tutorial and can be used for a lot of poncho variations. I did these two and it didn't take much time.
I used Rozetti Puzzle yarn, 100% acrylic, 1 ball - 200g / 300m (I used 3 balls) and 8mm crochet hook.
But honestly, you can use any yarn that will suits your needs.
Instructions can be found here:
and/or on "Pinterest".
Have a nice day.