The present invention provides reflective films and other optical bodies which exhibit sharp bandedges on one or both sides of the main reflection bands. The optical bodies comprise multilayer stacks M₁ and M₂, each having first order reflections in a desired part of the spectrum and comprising optical repeating units R₁ and R₂, respectively. At least one of the optical repeating units R₁ and R₂ varies monotonically in optical thickness along the thickness of the associated multilayer stack.