Tank Tops generally are a sleeveless t-shirt, meaning made from the same material. There are so many different styles and cuts now, and in some places they might go by the term vest. Generally speaking unless you are from down under they aren’t the same as a singlet.
Singlets are worn under things and are generally white and often ribbed, this a sleeveless undershirt. Tank Tops can be cut in many different styles, we have a range here you can choose from.