Where can I get a vintage swimsuit set for babies like this one?

Not sure what designs you are looking for, but found these design pretty timeless and think that any girl would look adorable in them: https://www.roxy.com.sg/girls-2-7-beach-bound-ruffle-one-piece-swimsuit-arlx103012?default=271939 http://cookids.com.sg/en/249-heart-frill-swimsuit.html http://www.frolikbeachstyle.com/collections/swimsuits