• Stretch denim (anything with elastane or spandex)

  • Lightweight or fashion denim

  • Poorly pre-shrunk during manufacturing

  • Cut off-grain or cheaply stitched

Skinny jeans and jeggings are especially prone because the fabric is already under tension before washing.

How to Fix Wavy Jeans (What Actually Works)

The good news? In most cases, you can fix it—at least temporarily.

Try this reset method:

  1. Wash the jeans again in cold water

  2. Skip the high spin; use a low or medium spin cycle

  3. While still damp, gently stretch the wavy areas by hand, especially along seams

  4. Lay flat or hang straight to air-dry—no dryer

For stubborn waves, a steam iron works wonders. Use steam, press (don’t drag) the iron, and let the jeans cool completely before moving them.

How to Prevent Waviness for Good

This is where most people go wrong.

If you want your jeans to stay smooth long-term, follow these rules:

  • Wash jeans inside out

  • Always use cold water

  • Avoid high-speed spin cycles

  • Never tumble-dry stretch denim

  • Wash jeans less often—spot clean when possible

And one big secret many don’t realize:
Hanging jeans by the waistband while damp helps gravity pull the fabric back into alignment.