Mr. Hansen’s clients also include businessman Joe Ricketts, who founded online brokerage TD Ameritrade. AMTD 0.99 % Mr. Ricketts asked Mr. Hansen to build him a purple “show wagon,” similar to a traditional stagecoach. Mr. Ricketts sent over a twill button-down shirt in a purple he was sure would make his wagon stand out at the Calgary Stampede, an annual Canadian rodeo.

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