Rose Nickels was kicked out of her gym because of the above "inappropriate attire". According to the people who sent her packing, her chest is larger than most in proportion to the size of her body so that makes this tank top look immodest her.
She details the experience in her Facebook post about the incident.
If this all seems ridiculous to you, that's because it is. But nonetheless the gym has stood by the decision to make her leave and Nickels has had to find a new place to exercise.