Hello Phoenix : How are you doing? Below is the partial answers for your question : Regarding the size of T-shirts in the States - In short, all the clothes in the U.S.A. have diffrerent sizes to those of Koreas. More specically speaking, youd better order L-size of US T-shirt if you wear XL-size in Korea. Regarding the price of T-shirts in the States - We can easily buy cheap T-shirts in downtown($2 to $10). In case of University T-shirts, however, they are very expensive($30 to $70). I hope this message helps you know about T-shirts in the States. And if you have any questions, feel free to contact me. Regards, Demisoda