If it's fat, you can't spot reduce but a good weight loss diet will take off inches. If it's muscle, it will be very difficult to stay in shape and yet reduce your legs' activity enough for the muscle to atrophy.
Have you asked friends if your legs look too big? It may just be your perception.
Personally, I really like well muscled legs on women.
"To give anything less than your best is to sacrifice the Gift."