Part of what made ladies Civil War fashions so lovely were the fancy undersleeves that were part of their garments. This public domain fashion image from a period magazine, show two examples of ladies at that time might have worn.
This vintage illustration is from The Lady’s Home Magazine Volume XV, a magazine published in 1860. It was edited by T.S. Arthur and Miss Virginia F. Townsend. They did not identify the illustrator(s) for their publication.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.