Yes, you can make a shirt bigger after shrinking it. Soak the shirt in lukewarm water with some hair conditioner to relax the fibers. Then, gently stretch it back to its original size and let it dry ...
Most of us have mastered the art of accidentally shrinking clothes in the washing machine. But if someone were to ask, chances are, you couldn't tell them how to shrink a shirt—the right way, at least ...