The defense ministry, with uniformed military officers and high-ranked civil servants in dark suits crowding hallways, may not seem the most liberal of workplaces.

The ministry is trying to change that perception in 2012.

The ministry said Wednesday it has designated every first and third Friday of the month as "Casual Friday," starting this year. The first dress-down day occurred last Friday, it said.

Officials said employees came to work in t-shirts, jeans, sneakers and runners.

The move is designed to "foster creativity and allow for flexibility" in the working environment, the ministry said in a statement.

"Since late 2010, we have tried to improve our working culture and we have been successful," the ministry said. "Our staffers have responded positively to the changes."

The government encourages public servants to dress down with short-sleeved shirts without ties during summer months to reduce the use of air conditioners and conserve energy. They may also wear "business casual" clothing year-round. (Yonhap)