Adult Baby underwear.
Newborn babies in Japan wear baby clothes like this.
This underwear is the same style as newborn babies.
This style is tied with a string.
Tie with string inside as well to prevent shifti

It is cool 100% cotton
Made in Japan

Size
M
Chest: 39inch
Length: 28inch
Sleeve length (from collar to sleeve end): 12.9inch

L
Chest : 44inch
Length: 30inch
Sleeve length (from collar to sleeve ends): 14.9inch

XL
Chest : 46、4inch
Length: 31.8inch
Sleeve length (from collar to sleeve ends): 16.5inch