I think most people absolutely could benefit, but not necessarily enough to level the playing field with the most gorgeous among us, while for others there really may be nothing they can do to level the playing field against even the most shoddily dressed average looking person. I've got nothing against trying to do the best you can with the hand you've been dealt, and wouldn't discourage anyone from doing that, but when we're talking about the innate bias humans have when hiring I think it's worth admitting that some will always have a considerable disadvantage regardless of their best efforts.