Why were soldiers wearing american revolution uniforms in the American civil war?

Sources:

Uniforms of the Civil War
By Francis A. Lord, Arthur M. Wise

The Story of Winchester in Virginia: The Oldest Town in the Shenandoah Valley
By Frederic Morton

A Brotherhood Of Valor: The Common Soldiers Of The Stonewall Brigade C S A And The Iron Brigade U S A

The Big Book of Civil War Sites: From Fort Sumter to Appomattox, a Visitor's Guide to the History, Personalities, and Places of America's Battlefields by Eric Ethier

Fateful Lightning: A New History of the Civil War and Reconstruction
By Allen C. Guelzo

Avenging Angel: John Brown’s Raid on Harpers Ferry 1859
By Ron Field

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