I agree with the comments about muscle building (or not, in our case, as women).
When I was losing weight, I took a lot of measurements to get a realistic impression of what was going on. As long as I was in calorie deficit, the measurement around my thighs kept decreasing. Once I went onto maintenance calories, the decrease stopped, and I noticed a very slight increase (about half a cm) in the measurement of both thighs over the next 6 months.
The important thing is to look at your body properly. When I look down at my legs, my thighs look very chunky and heavily muscled. When I actually stand still and look in the mirror, I realise they actually look slim and lean.