Buy cotton shoes when it rains, and realize a dream.

It's best not to wear cotton shoes in rainy days, it's easy to get wet. Your subconscious is saying: it's raining, which implies that you have some difficult things to deal with recently. Buy: hint that you are trying to solve the problem, cotton shoes: hint that you may have spent a certain price, but contrary to expectations, you have not found the correct method and trick to solve the problem.