Howard. The following is a paraphrase of Flynn's story:
Mr. Gumpox had two suits; one was for Sunday and the other was for everyday.
There came a time when the old working suit was no longer good enough to wear anyplace. So then he bought a new one for Sunday (the former Sunday suit would be the work clothes.)
Gumpox showed up one day at the stall to get Howard. Howard saw him wearing the old Sunday suit and refused to get up. The horse thought it was Sunday.
___________________The date is unknown and the title is made up by me only for identification purposes.