REPOSHING ! Tank top with bow at back

Great tank top with a very cute bow at back . It was sold as a sz L however nowhere near a large and the wash care/sz label is washed off. I think the posher just guessed . I would say the tank is a medium that runs small at best ( better for someone not too busty).I generally wear M and couldn't get over my bust. I did like the tank and chose not to complain that size could not be verified because I thought I can give it to someone ....but trying here first