1. Wear black, black gives you an slim,and very thin appearance, when standing, and sitting.

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Wear things like black high wasted skinny jeans, black trench coasts, black modest top, black mid skirt or even black thin dresses.

2. Walk around a lot, it will help to to do a lot of moving around(i do), for a while, to keep your thin figure in shape, or just go for walks, and runs.

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3. Good posture

Let your arms hang naturally down the sides of the body.
Stand straight and tall with your shoulders pulled backward.
Tuck your stomach in

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4. Don't cake up so much make up, just bit makeup to bring out natural beauty.

Hope this help y'all guys :)