T-shirt with a sentence on the back
One thing very popular these days in Japan is wearing a T-shirt with a Japanese sentence on the back. This ASICS T-shirt is one of the best selling T-shirt. It says "If you are serious, put ASICS on!" The caracters are written like calligraphy.

The Japanese young people tend to prefer more westernized things, such as music, clothes, hair style, food, and even lifestyle. T-shirts with logos of the American companies and brands have been the champion of T-shirts for a long time. But a new trend came up. I am not sure when it started, maybe a couple years ago. Very Japanese classic designs with paintings and Chinese characters have appeared on T-shirts. They think it's cool to wear Japanese tastes as a fashion.
Some athletes make their own T-shirts with the original design. They make up sentences which express their beliefs, goals, and spirit. I believe they get power and energy for the best performance by wearing the favorite T-shirts of their own.