The Cut caught up with Carolina Herrera last night, and when asked whether shed ever do a diffusion line for Target, responded very much in the affirmativeif Target asked her, of course. So get cracking on that engraved invitation, Target, mmkay? The gracious designer also noted that Isaac Mizrahi is perfect for a diffusion QVC line because hes a natural actor.Herrera is known for beautiful, well-tailored dresses done in interesting prints and lovely fabrics. Until the Target pipe dream comes