To lose fat in your thighs and hip area you will need to participate in a full body fat loss routine. I am sure you have heard that you cannot spot reduce. So instead we must focus on dropping fat from the body as a whole.
Here are my 5 guidelines for doing just that
1) Eat 5-6 small meals throughout the day. Each meal should be 2-3 hours apart. Each meal should contain one protein and one carb. Your first meal should be within an hour after waking.
2) Drink lots of water
3) Rest properly. This means taking at least 24-48 hours between strength training the same muscles, and it also means getting at least 7-8 hours of sleep per night. Lastly, it means taking 1-2 days off from exercising per week.
4) Cardio. This should be done at different intensity levels and different session lengths. Consider doing a low intensity/long session, a high intensity/short session and a few medium intensity/medium length sessions.
5) Strength Training. Strength train each muscle 1-3 times per week. You should lift a proper weight and perform the proper amount of sets/reps for your strength training method.
All of the above things combined will result in fat loss.