The museum was free, although they did accept donations. The exhibit currently had one on restoration of fabrics and comparing traditional clothing in some of the Oaxaca communities and saris from India. They do have guided tours a couple of times a week, including at least one in English. I didn't particpate in a tour, but saw them advertised.
If you own or manage Museo Textil de Oaxaca, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.