As someone who is covered in tattoos, I cannot imagine using tank tops. I knew when I got my tattoos that it would highly effect the clothing I could wear in any situation. I'm just starting out and whenever I first make contact with a customer I wear long sleeves and pants to look professional. When I mow I do wear shorts and t-shirts, but usually the customer is not home since they are at work as well. I cannot imagine how the image of a business with tank tops on anyone would appear to potential customers. Especially when tank tops are on tattooed or appear somewhat out of shape individuals. As I said, I have a significant amount of tattoos and also have a pretty big beer belly (gotta celebrate the end of the day somehow), but I would NEVER wear anything less than a t-shirt.
Keep your dreams alive. Understand to achieve anything requires faith and belief in yourself, vision, hard work, determination, and dedication. Remember all things are possible for those who believe.