I had an old tank top that I loved. I looked at the label and amazon carried it. I was so happy. Im 56 180 and my old shirt said XXL. I ordered theses in the same size and it fit perfect. I even gained 20 pds due to pregnancy and wore my old one throughout my pregnancy. Love them. They get softer over time and they're not so short they go below the waist which I like because I can cover my butt if Im wearing leggings.