I do not think it is easy to decrease fat and muscle in our legs, especially in calves. I do not buy those methods and tips in the beauty and diet magazines. Thighs are easy, but calves are very difficult.
In my case, I have had too skinny legs since my childhood. After 5-year jogging, my legs became very strong. I can feel muscle in my thighs. It is like steel. If I do not excercise for a while, then I feel fat accumulates in my thighs, but not in my calves. There has been nearly no change in my calves regarding muscle and fat.
Nevertheless, I see a TV celebrity who dramatically decreased the thickness of her calves. Probably she could invest a lot money in plastic surgery, although the effect is dubious.
Barbie~~