As the weather turns to spring, New York City law firms are once again turning their attention to dress codes. This year, Cravath, Swaine & Moore, previously one of the last all-formal holdouts, will be going casual on Fridays from May through September. The firm sent a memo to employees on Monday, informing them of the new policy and asking only that they “exercise good judgment.”

“It seemed like the right thing to do,” said managing partner Robert Joffe, who stressed that the new policy applied to Fridays only. “We’ll take things one step at a time,” he said.