I also have muscular legs (Thank you, Mom!). I will do traveling (walking) lunges with an extended stride. In addition, I will change my leg routine to lite to moderate weight, higher reps and no squats. This seems to help define the muscle more so than to build w/o sacrificing the mass.
Oh, and long cardio sessions on eliptical trainers (45 mins. plus)
If your clothes fit you differently, maybe try a different style?