As much as those selling books and products would like to have you believe otherwise, there is no physical way to spot reduce. I know, I was crestfallen to learn this while studying for my personal trainer certificate in the late 90s. Every body is a unique combination of features -- including where the body decides to store the fat. Some get to store it in their breasts -- to our envy, until is starts sagging to their navels.
Then there's me, who stores it in their thighs.
HOWEVER, there are things you can do. As it turns out, scientists have discovered that the body often -- not always, but often, stores fat where your ancestors needed it most (and your genes took notice). Fat is the body's storehouse of energy, and it turns out that the muscles use the fat stored nearest before it goes elsewhere. So, if you work the muscles closest to the fat, you have a chance to whittle those deposits down.
I warn you, though, that what your body senses as working may be different than your thoughts. You might do all the thigh exercises you can identify, and while you feel your thighs are getting exhausted and should be burning the fat, your body sees a greater need to your lungs and rib muscles, so it consumes more of that breast fat than that thigh fat. I know -- unfair!
So, before your body starts working on that thigh fat, you have to build up the strength in your upper body. Bottom line: fitness is a full-body workout. You cannot escape it.
In closing, I caution you away from fat-free diets, as a means to reduce your fat deposits. Your body needs fat, protein, and carbohydrates, in moderate quantities, to operate. If you reduce your fat, the body will convert the other two macro-nutrients to fat, so just eat a well balanced diet -- with fewer "treats", unless your treats are vegetables.
Be well -- and love your whole body.