Day-O, Calypso pants for guys, you bet, white cut just below the knee, Hawaiian shirt tied at the waist. A fashion statement of the 1950's at Marin Town and Country Club. And the Banana Boat Song.
Years ago Riordan had no uniform as such save the school jacket with leather sleeves or the school car coat.
Now I see there is almost a full uniform required white sweater, Tie all the required clothing on the school website. Wearing a white sweater daily your going to need at least 3 to keep the dry cleaner busy, it's getting spendy.