A classic cotton T-shirt with the text "Problem solved!" and a drawing of a heart with a tourniquet tightening around it symbolizes lifesaving. The distinctive shape of T-shirts evolved in the early 20th century from the previous underwear (known as a union suit). After World War II, cotton T-shirts in the shape of the letter T became very popular, partly thanks to Marlon Brando and James Dean, who wore them on screen.
