What Poses Help Me Look Slimmer in Boudoir Photos?

For standing poses the most effective ways to look slimmer are as follows:

Angle your torso 45 degrees to the camera. Hips straight on shows you at your widest.
Put one foot slightly forwards and the other slightly back and put all your weight on your back foot.
Put your hands on your hips or clasp them in front of yourself being mindful to create space between your arms and body. Not too much so it looks stiff, and remember to relax your shoulders!
If you’re worried about a double chin, think about pushing your forehead towards the camera to define your jaw line.

For poses lying on the stomach or back these tips will help you look slimmer in for your boudoir photos:

Poses on the back are slimming because gravity flattens out the belly most in this position. Remember to arch your lower back to maximize the effect.
Poses on the stomach are slimming because the pose hides your belly.
Use bed sheets to strategically hide the tummy as needed.
Find a supportive bra, this will make your bust look larger and tummy smaller by comparison, especially with poses lying on your back.