I found the tutorial from this website (Onsie vest tutorial.)
I made the inside and outside of my vest from old men's shirts I found at a local Good Will (each $2.99)
The tie I folded into a point at the bottom and ran a stitch, and pinched at the top to create a ''tie" look. I then put a stitch in to hold the tie part and ran a stitch across the top.
As a beginner sewer, I will say that I had the hardest part with all the corners in the vest, if you are a regular sewer than this will be a breeze for you!