It’s the first Seersucker Thursday in the Senate for 2018.

The tradition of wearing these lighter-fabric suits re-emerged in the late 1990s at the urging of former Majority Leader Trent Lott. The Mississippi Republican wanted to show that “the Senate isn’t just a bunch of dour folks wearing dark suits and — in the case of men — red or blue ties,” according to the Senate historian.

Today you’re likely to see lawmakers and staff from both sides of the Capitol in seersucker suits, in what’s become an annual tradition to honor the garb, its Southern roots and its necessity as a Senate uniform back in the days before air conditioning. 

Here’s the day in photos: