Are the work clothes of wudongde hydropower station employees graded?

Points. Wudongde hydropower station is a public institution directly managed by the government. The employees of this unit are all customized by the unit, with blue as the basic employee, black overalls as the leader and white as the leader, so they are graded. Wudongde hydropower station is located on the main stream of Jinsha River at the junction of Luquan County, Yunnan Province and Huidong County, Sichuan Province.