There are a number of reasons your cotton trousers might feel too tight. Washing them in warm or hot water, or running them through the dryer will cause them to shrink, making them almost impossible to fit into. Sometimes you may even overindulge, and find you gained a few pounds, making your cotton trousers fit tight. Stretching the waist of your cotton trousers is relatively easy.
Wet the waist of your cotton trousers.
Insert the waistband stretcher into the waist your trousers, clipping one end of the stretcher to the waistline of your trousers.
Position the opposite end of the stretcher against the other side of your trousers.
Turn the knob beside the clip, adding up to five inches to the waistline of your trousers.
Allow the trousers to completely air dry before removing the stretcher.