Strictly speaking, singlets, of whatever colour, should be worn under the coat.
THE HUNTSMAN'S STORY.
I heard the huntsman calling as he drew Threeacre Spinney;
He found a fox and hunted him and handled him ere night,
And his voice upon the hill-side was as golden as a guinea,
And I ventured he'd done nicely—most respectful and polite—
Jig-jogging back to kennels, and the stars were shining bright.
Old Jezebel and Jealous they were trotting at his stirrup;