馬子にも衣装 mago ni mo ishō
“Even a packhorse driver looks fine in proper dress.” or [“Clothes make the man.”]
Before there were automobiles in Japan, packhorse drivers were truckers and deliverymen. They dressed in practical and plain clothes, paying no attention to his fashion or appearance. Nowadays, appearances matter. Weather you are a taxi driver or a farmer, you can still suit up and look like a gentlemen.
“Even a packhorse driver looks fine in proper dress.”