Fold up the vest lengthwise and wear it like a shawl.
PHOTO WILL COME
It will look like this:
Open up the shawl.
Put the halfway point over your right shoulder.
Tie a double knot over your left shoulder.
Pull the part with the double knot to the back.
It gives the front part a nice drape.
Pull the double knot to the front.
It's almost like wearing a light jacket then.