TOKYO TEES: Japanese fashion brands Undercover, Sacai Luck, Kolor, N. Hoolywood and White Mountaineering are in a charitable mood these days. Each house crafted a special t-shirt to benefit a project called Atelier Incurve, which provides training, workspace and exhibition venues for mentally handicapped artists in Japan. Atelier Incurve kicked off an exhibition of its artists' work with a party in Tokyo's Marunouchi on Monday night. The t-shirts, which retail for 5,040 yen, or about $60, made their retail debut at the event. They are now available at several United Arrows locations and can be purchased online through Cibone, Yoox and Zozotown.