It can be made in Japan.

In the mid 1950's, the word T-shirt was still not well known.
The very first T-shirt known as "IROMARUKUBI [Color Crew Neck]" which led the Japan made T-shirt was produced in our factory based in Honjoishiwara, Tokyo as if to announce the beginning of the T-shirt culture in Japan.
Since then, more than half a century, the skilled artisans give a stitch to the flexible fabric which are sewn and gently dyed in Japan.
It is our joy and pride to provide the long lasting product with the finishing that can be felt by the five senses.

http://kume.jp/