A FEW WEEKS AGO, Michael Preysman, the founder of fashion label Everlane, and his head of creative, Alexandra Spunt, went on a seven-day road trip through China to visit the factories where their silk blouses and cashmere sweaters are made. The purpose of the sojourn: to check in with their factories, and share their findings with customers via videos and photos to be posted on the Everlane website.

An earlier video series showing their T-shirt factory in Los Angeles had been quite popular with online visitors, said Mr. Preysman. "So we said, 'Hey why don't we tackle China?' "

The reason for the journey was partly to address skepticism surrounding Chinese facilities. "We wanted to clear up this misconception around China," said Mr. Preysman. "You can actually work with really great factories over there. And for silk, China is the best in the world." Videos and detailed images of the trip are now on the company's Tumblr page and will soon appear on its website, alongside products made there.

Everlane isn't the only fashion brand to make transparent production central to its philosophy. Just as the Slow Food movement prizes practices that are gentle on the land and the body, a wave of labels and retailers are focusing on socially responsible methods. These companies appeal to the growing number of consumers who want to know what kind of impact their purchases will have—both on the environment and, now more than ever, on other human beings.

Sweatshop labor—and the ethical issues surrounding it— is nearly as old as the Industrial Revolution. In more recent history, Nike was widely criticized for its factory practices in the '90s and early '00s; but the company has made efforts to improve its methods. Since 2005, Nike discloses the name and address of every factory it uses.