If you're just doing Pilates, you are not going to lose weight. Pilates is for toning. Shaping your muscles. That is why I love it. I am not looking to add muscle nor make them any itty bit bigger, just shape them. So with 30-60 min of cardio a day, I burn off calories/continue to lose weight and with Pilates, I tone my body. It's taken me almost 2 years to not only hear this but realize that this is most effective for me.
I suppose that I dont need to that much cardio anymore but it's nice to have that cookie after a salad. Haha