This sweatpant is vintage style that is very thick and heavy weight.
The biggest difference between a mass-produced machine called a sinker knitting machine and a fabric knitted by a loop wheel machine is the touch that wraps the soft body.
We use cotton thread for sewing to enjoy aging.
Also, in consideration of long-term wear, these sweatpants are made with attention to detail, such as suppressing the skew of the fabric by alternately knitting S and Z threads.