His wife's description of his uniform he wore on the day of the Grand Review, May 23, 1865.
…The wide felt hat that was captured from a Confederate officer. The shirt of blue flannel was purchased from a Government gun boat in the Potomac river. The necktie was scarlet. General Custer began to wear the red tie when he was a Brigadier General… The badge on the tie was that of the Michigan brigade with the motto of the State and the name of Custer.
From Custer in Photographs by D. Mark Katz 1985
Transcribed from a photocopy of her handwriting by yours truly.