Fill a basin, or sink with warm water and immerse your shirt in the water. Allow it to soak for 15 minutes.
Wring the water out of the garment. As you wring out the water, gently stretch the fabric to elongate the fibers.
Lay a towel on a flat surface. Place your shirt flat on the towel. Press another towel on top of your shirt and use it to pat down the shirt. Your goal is to absorb the extra moisture, so your shirt is damp but not wet.
Remove the top towel and hold the top of your shirt with one hand. With your other hand, gently pull the bottom of the shirt. Place your hand on the bottom of the shirt and use your other hand to pull the top. Pull until your short slowly approaches its original length. Hold the shirt from the left side, repeating this procedure by tugging on the ride side. Repeat this method until your shirt starts to look normal again.
Allow the shirt to air dry on the towel.