Sew in a long strip of contrasting fabric (like lace, leather, or a different denim) from the waistband down to the hem. This adds width and a designer look. The "V" Gusset For minor tightness at the very top of the hip:
After any alteration, press your seams flat. This makes the difference between a "homemade" look and a professional finish. Altered Clothing: Hip Fixes and Transformations...
The waist fits, but the back of the waistband pulls away from your spine. Sew in a long strip of contrasting fabric
When adding panels, ensure the fabric grain of the new piece runs in the same direction as the original garment to prevent weird twisting. This makes the difference between a "homemade" look
Excess fabric that pouches out at the widest part of the hip.
"Smile lines" or strained fabric across the front or back, indicating the garment is too tight.