T-shirts were originally worn as undershirts. This still occurs, but T-shirts are now also frequently worn as the only piece of clothing on the top half of the body (other than possibly a bra or an undershirt (vest). T-shirts have also become a medium for self-expression and advertising, with any imaginable combination of words, art and even photographs on display. In the early 1950s several companies based in Miami, Florida, started to decorate tee shirts with different resort names and various characters. The first company was Tropix Togs, under founder Sam Kantor, in Miami. They were the original licensee for Walt Disney characters that included Mickey Mouse and Davy Crockett. Later other companies expanded into the tee shirt printing business that included Sherry Manufacturing Company also based in Miami. Sherry started in 1948 by its owner and founder Quinton Sandler as a screen print scarf business and evolved into one of the largest screen printed resort and licensed apparel companies in the United States. A T-shirt typically extends to the waist, although one fashion is for "oversized" T-shirts that may extend down to the knees, namely in modern hip hop fashion. A more recent trend in women's clothing involves tight-fitting "cropped" T-shirts that are short enough to reveal the midriff. Another popular trend is wearing a "long-sleeved T-shirt", then putting a short sleeved T-shirt of a different color over the long sleeved shirt. This is known as "layering". In the 1960s, the ringer T-shirt appeared and became a staple fashion for youth and rock-n-rollers. The decade also saw the emergence of tie-dyeing and screen-printing on the basic T-shirt. In 1959, plastisol, a more durable and stretchable ink, was invented, allowing much more variety in T-shirt designs.[8] Variants of the T-shirt, such as the tank top, A-shirt (with the nickname "wife beater"), muscle shirt, scoop neck, V-neck etc. eventually came into use.