P.T.A. LSG is a members-only T-shirt that has been delivered with a different design every year since 2008. LSG is an abbreviation for "lesson-gi," meaning "clothes to wear for lessons" in Japanese. The early LSG had a colorful and flashy body so that anyone could tell at a glance that the wearer was a member of P.T.A., but over the past few years, there has been an increase in simple designs emphasizing ease of wear and maturity. By arranging them like this, you can also get a sense of the changes in the tastes and preferences of the members from the changes in the design of the T-shirts.