The change appears to align with the company's "Back to Starbucks" strategy under CEO Brian Niccol, who assumed the role in August. The barista union has objected to the dress code change.

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

Starbucks employees will have new rules they’ll have to follow. Read more trending news Starting on May 12, baristas will have to wear solid black tops so the iconic green aprons stand out more. The shirts can be short- or long-sleeved and either crewneck,