How can I get thicker?

Ok so my body is petite pair shaped, I have a butt but you can't notice it until I wear shorts leggings and crop tops. But hips are 36in and waist is 26in. I'm waist training and it's improving but I want my butt and hips 2 or 3 inches bigger. I'm 5'6. Are there any foods to increase it. I do lounges, squats. But I don't see improvements.
How can I get thicker?
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