The simplest thing is to use the scale dials to make the bandeau bigger. You could scale it uniformly or just make it longer and wider as needed to fit over the hair you're using. I made them fit snugly for several reasons. One was for people like me who like to draw hair post-render. Another was that it's impossible to accomodate every possible hair object, as they are not uniformly sized by any means. Also, short hairdos were in during the flapper era, sometimes very short and close to the head. And lastly, a real bandeau, like a headband, would tend to flatten the hair under it a bit.