On Monday, Starbucks rolled out a new dress code as part of its larger corporate overhaul. But union workers say the change is both restrictive and unproductive—and now, baristas are walking out.

Baristas are now expected to wear solid black shirts and khaki, black, or blue denim bottoms. Some Starbucks workers are sharing on TikTok what the new dress code looks like: According to an April memo, Starbucks promised to give each worker two free shirts to get them started.