What ever your reason for wanting to go with a one-piece swimsuit this summer, rest assured that both the days of the ho-hum one-pieces destined for your grandmother, with skirts cut so low you might as well call them maxis and those with cut outs so crazy, you might actually be better off in a bikini, are over. Today, swimsuit designers offer savvy shapes that feature ruching or color blocks and support in all the right places.