How do you remove stiffness from new garments?

To remove stiffness from new garments, try washing them with a gentle detergent and adding fabric softener during the rinse cycle. You can also tumble dry the clothes on a low heat setting or air dry them, while occasionally shaking or fluffing them to soften the fibers. Additionally, wearing the garment can help break in the fabric, making it more pliable over time.