How to say 'mantala' in English?

It seems that 'smock' or 'school smock' could be appropriate terms for referring to the overalls used in many classrooms.

Smock: n. A loose coatlike outer garment, often worn to protect the clothes while working. (Answers.com)

Information on the history of school smocks




Little girl with school smock and carrying backpack with books.
Village: Volce.
Date: 1978 June

from http://www.library.umass.edu/spcoll/galleries/halpern78f.htm