Here we have a "chemise a la reine" made famous by Marie Antoinette who caused a scandal by being painted wearing a simple white muslin dress. Poor Marie :-(. This was popular in the 1780s and was often worn with a colored silk sash.
This 18th Century French Fashion Plate shows how fashions were altered during the Revolution to reflect political beliefs. These ladies are clearly Republicans, with their tricolor striped gowns and cockades pinned to their hats and the bodices of their walking dresses.