What does clout mean in don't cast a clout till may out?

In the phrase "don't cast a clout till May is out," the term "clout" refers to a cloak or a piece of clothing. The saying advises against making premature decisions or assumptions until the appropriate time has passed, in this case, waiting until May when the weather is more settled and suitable for lighter clothing. Essentially, it highlights the importance of patience and timing in decision-making.