Ruth La Ferla The New York Times

Ball boys at US Open will wear a special Ralph Lauren shirt that will monitor heart rate, breathing and stress levels.

When Kate Middleton strides down the aisle at Westminster Abbey on Friday, millions of Americans watching at home will be transfixed by her gown. Few more so than Don O'Neill. Mr. O'Neill, the creative director of Theia, a bridal house in Manhattan, expects that Ms. Middleton's dress (or a much more affordable version of it) will be coveted by brid...

Ball boys at US Open will wear a special Ralph Lauren shirt that will monitor heart rate, breathing and stress levels.

When Kate Middleton strides down the aisle at Westminster Abbey on Friday, millions of Americans watching at home will be transfixed by her gown. Few more so than Don O'Neill. Mr. O'Neill, the creative director of Theia, a bridal house in Manhattan, expects that Ms. Middleton's dress (or a much more affordable version of it) will be coveted by brid...