From a story on axios.com by Hans Nichols and Barak Ravid headlined Schumer ditches Senate’s informal dress code”:

Senate Majority Leader Chuck Schumer quietly has directed the Senate’s Sergeant at Arms to no longer enforce the chamber’s informal dress code for its members.

Why it matters: The new directive will allow Sen. John Fetterman (D-Pa.), who tends to favor gym shorts and hoodies over the business attire traditionally required in the chamber, to linger on the Senate floor before and after votes.

“Senators are able to choose what they wear on the Senate floor. I will continue to wear a suit,” Schumer said in a statement to Axios.