Small flat behind:
If you have a small flat behind and your jeans tend to make you look smaller, choose a design with detailed pockets that are high and slightly smaller than those found on most styles. Pockets will drawn attention to the eye and will create the illusion of width and lift.
To add curves Wear low-rise jeans in a cotton-Lycra blend. The clingy fabric hugs the body and a contoured waistband will help create curves. Choose a pair that has been lightened at the
thighs and knees to make legs look more shapely. Avoid standard boot cut jeans that have little shape.
To flatten a tummy:
Try a medium to high-rise (no higher than the belly button) in a dark color.
For the appearance of smaller thighs:
Stick to dark colors for sure and wear flared styles that will draw the eye downward and create balance. Don’t wear them too tight or too loose.
For the appearance if slim hips:
Do look for jeans without front pockets or jeans with slit pockets and stay away from front patch pockets. Buy dark colors with stitching that is the same color (or very close) as the fabric. Avoid light stitching and designs.
To prevent a gap at the waist:
If your hips are much larger than your waist then you will probably have this problem. What to do? Wear stretch denim jeans and stay away from crisp or heavy fabrics such as cotton.