I wanted to experiment with some vest tops I had to hand as they didn’t really offer much of a look as they were. They had a string vest like netting on the top and a contrasting block colour underneath.
I started with some top stitching on machine and by hand and then cut out sections of the top layer to reveal the base layer.
This could easily be done by adding various bits of fabric on top of an ordinary top and then stitched and cut away. Maybe a button or two for good measures.