Wear the jeans while they are slightly damp and move around to loosen the fabric
Spray tight areas with lukewarm water until damp, then pull and stretch them by hand
Do squats, lunges, and bends while wearing the jeans to help expand the fit
Use a waistband stretcher or pant stretcher for targeted stretching
Insert a chair back, pillow, or rolled towel into tight areas and leave it overnight
Pull the waistband, thighs, or calves gently in multiple directions by hand
Soak the jeans in lukewarm water, then put them on and wear them until dry
Steam the tight areas with an iron or steamer, then stretch the fabric while warm
Repeat stretching regularly after washing to maintain the looser fit
Avoid hot water and high heat drying to prevent jeans from shrinking again