cast a clout till may be out

The phrase "cast a clout till May be out" is a traditional saying that advises against removing or shedding warm clothing until the month of May has passed. "Clout" refers to a piece of clothing or outer garment, and "may" represents the month of May. The saying suggests that even though the weather may start to feel warmer during springtime, it is wise to continue wearing winter clothing until the month of May has ended since unexpected cold weather or frosts may still occur.