Question: how to unshrink a shirt?
Answer: Use lukewarm water and gentle shampoo or soap. Fill a sink or tub with lukewarm water and add a capful of baby shampoo or hair conditioner. ... 
Soak for up to 30 minutes. ... 
Gently remove water from the clothing. ... 
Lay the clothing on a flat towel. ... 
Lay the clothing on another dry flat towel. ... 
Let the clothing air dry.