Pull on your too-snug pair of skinny jeans or flares. Use the help of a water bottle to mist the thighs of the jeans. Applying water to the denim allows it to stretch more easily, creating a fool-proof way to loosen the slacks. Squirt any other areas of the jeans that feel too tight, getting them damp enough that they can take on new shape.
Practice doing squats, bends or wall sits to loosen the thighs of the jeans. You might feel like you are in a comedy movie scene, but these stretch-out tricks do work. Spend a fair amount of time doing such moves, followed by at least an hour of relaxation in the pair. The more lounge time spent in the jeans, the cozier they will begin to feel.
Steam dry the jeans for the pair that is ultra stubborn. Hang the snug slacks in the bathroom as you shower, allowing them to take on the moisture and heat from the room. Be sure to shut the bathroom door to keep all that steam in. This absorption helps the jeans to loosen up and is a sure-fire way to make them comfortable.