This blog is written by author Sachiko who is not a native speaker of English, so it may be hard to read. It is translated from the summary of Japanese page; http://akitaodatelifejp.hatenablog.com/

“Monpe”, Japanese work pants

It is loose-fitting and elastic waist pants for working.

It is comfortable, and this is warm type, so I wear it as a loungewear in winter.

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