T-shirts are the most popular and commonly worn clothing by men today. They have never been out of style since their dawn in the 19th century. This is because t-shirts are the most comfortable, easy and versatile garment ever. T-shirts were originally worn as undergarments by American soldiers. They were well-liked because of the comfort they offered. When working in hot environments, soldiers took off their uniform jackets and wore only t-shirts. Veteran soldiers starting using their t-shirts as an everyday garment.