Subject is exactly garment industry
Merle Linda Wolin, then the Los Angeles Herald-Examiner's first and only reporter covering Los Angeles's Hispanic community, went undercover as an undocumented sweatshop worker from Portuguese-speaking Brazil, under the name Merlina de Novais. Over five weeks, she worked three different jobs, even though she had minimal sewing skills. She spent the better part of a year reporting the story, including the court proceedings over a suit she brought against one of the employers who refused to pay her.
Charles Chapin, editor of The Chicago Times, hired Nell Cusak to investigate female working conditions in Chicago's factories. This 21-part series (published under the byline Nell Nelson) was based on the author's experience working undercover in several Chicago factories. Nelson named specific factories and managers she encountered, detailing the working conditions after spending only a brief time in each factory.