1) Halter cousin 2) Low-cut shirt 3) Shirt style 4) Sleeveless casual shirt 5) Sleeveless garment 6) Sleeveless shirt 7) Sleeveless summer shirt 8) Sleeveless t-shirt 9) Sporty shirt 10) Summer shirt 11) Summertime shirt 12) Warm-weather wear 13) Wife-beater, by another name 
A short, sleeveless top with wide armholes.
A tank top is a knitted, sleeveless, informal waistcoat-like garment typically worn by men over a shirt. The term is also applied to a woman's vest-like, sleeveless finely knitted informal garment worn without an undershirt.
[n] - a tight-fitting sleeveless shirt with wide shoulder straps and low neck and no front opening
noun a tight-fitting sleeveless shirt with wide shoulder straps and low neck and no front opening; often worn over a shirt or blouse