"When he lifted the tent flap,however, he saw high booted figures, their uniforms dark in the pearly glow before sunrise,"

"He hesitatated, then picked up a sleeveless raincoat- which he supposed was his own but was his wife's cut, drawing it on along with a shawl shethrew over his head and shoulders"

Shelby Foote; Red River to Appomattox

Evelyn,as you can see they were carrying raincoats, but it wasn't raining,,,,