Wigs, stockings and heels were associated with being of the aristocrat class. Which, as the article states, could make one wearing such things a target.
I think you're misreading that a bit (it is confusingly written).
> During the French Revolution, wearing dress associated with the royalist Ancien Régime made the wearer a target for the Jacobins. Working-class men of the era, many of whom were Revolutionaries, came to be known as sans-culottes because they could not afford silk breeches and wore less expensive pantaloons instead
_Prior_ to the revolution, the Jacobins (who were largely bourgeoisie) would have been wearing that dress, distinguishing themselves from the working class (who _didn't_ wear the stockings). The revolutionary period is being used to illustrate a change here, not the norm.
