I wish I'd seen this thread before finishing THIS render.  Glowing armpits drive me crazy! (I'd like to re-try this with IDL turned down, but I'm rendering an animation right now . . .)

I used an Environment Sphere with two point lights (the one behind the figures at 10%, the one in front at 20%) and IBL, using the same HDRI image I used on the environment sphere. Reflections in the mirror took many hours to render, even with Raytrace bounces set at 2.  All the texture maps are set at .85, but the dress patterns are still nicely visible.