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.A Mens T-shirt typically extends to the waist, although one fashion is for "oversized" Mens 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".