At that time, American T-shirt manufacturers only produced T-shirts with pure colors and no patterns, and soon there was no market. People don't like this monotonous dress. Later, after cleaning up the garden at home, the director took a T-shirt to wipe his face. I wiped it, and there was a pattern on it. He got inspiration from it and made a fortune.
The pattern in the movie was the pattern on the T-shirt which was very popular at that time.