, Firstly, congrats on your weight loss that's awesome!!
I think you are doing great workouts for your legs overall as it is and maybe you can add some more variety in your workouts... I love lunges, like walking lunges, one legged lunges. You don't mention if you go to a gym or not but you can do lunges in a smith machine rack add a bench behind you and put your foot laces down on the bench and do a one legged lunge that way. There are numerous variety of lunges. lunges also on bosu balls, sumo squats on bosu balls,
I never work inner or outer thighs specifically because I have read that if you make the muscle there larger it will lmake your thighs look larger and I certainly don't want larger thighs.
Also, I was thinking that because you have lost a large amount of weight maybe what you saw during your Pilates class was just loose skin that looks like a shrunken water balloon, unfortunately this may or may not go away with time
.... Every one is genetically different that way.
I hope this helps and keep posting