Starbucks is updating its dress code, limiting the amount of colors staff can wear with its green aprons starting on May 12.

Starbucks announced this week that their employees will implement a more specific dress code in order to make their signature green aprons pop.

Under the new policy taking effect, baristas will have to wear any solid black short and long-sleeved crewneck, collared or button-up shirts with any shade of khaki, black or blue denim bottoms. Starbucks is going to be providing two new complimentary company-branded T-shirts to its workers. Those can be worn, too.