I have the opposite problem to you. I have virtually no boobs left but still plenty of covering on my bottom and thighs. This way of eating has removed a lot of weight from my hips, upper torso and arms, more so than other times when I have lost weight - tho those losses were not thru diet but thru exercise, I haven't lost weight thru diet since a teenager until 5:2.
I guess our bodies can react to different weight loss regimes in different ways, tho I understand that weight loss generally is all over, but it may be more noticeable in some areas. And not sure there is much we can do to target weight loss to particular areas, all we can do is get the relevant muscles toned as best we can.
And if you are slim, providing your boobs aren't too big, I would say they are an asset!!