I don't think you'll be able to show all of them at the same time unless you go with a bikini.
For the upper back and arm tattoos, I would suggest halter tops.
For the stomach, crop tops might be cute... like, tee shirt style, but short so that her stomach shows.
For legs, shorts or short skirts would do nicely. Depending on where the tattoos are located, capris might also work.
Did that help at all? I hope it did!