This is a UMIBOZU pattern with the head slightly out of the pocket as if the mouth were moving.
It's like saying, "Let's play."
I'll look up at you, master.
The front, sleeves and collar are made of cotton hemp fabric with a fine check pattern, while the back, front hem and cuffs are made of T-shirt fabric.
The use of T-shirt fabric on the back adds elasticity, and can be worn as a relaxed shirt.
With the use of T-shirt fabric on the cuffs, even if you roll up the sleeves, it will stop at that position, making it easy to roll up the sleeves.
It also solves the problem that the cuffs are far below the sleeves, which women tend to wear with oversized shirts.