A "simple tank top" refers to a basic sleeveless shirt made of lightweight fabric, often worn during hot weather or as a layering piece. Full definition
You can dress them up and make them look sexy, like I did here, or wear them with a simple tank top and sandals for a casual look. (thegirlfrompanama.com)
So I went with easy swing dresses, linen pants and shorts and simple tank tops. (puppiesandpretties.com)