Original sentence: At most dances, no special outfits are worn, but "peasant skirts" or other full, lightweight skirts are popular, as these have a very pretty effect when swinging or twirling and some people find them more comfortable to dance in than pants.Booking ahead (lining up a partner or partners ahead of time for each individual dance or set), while common at some venues, is often discouraged and decreases the number of available dancers for those seeking partners for a particular set
Edited sentence: At most dances no special outfits are worn, but "peasant skirts" or other full, lightweight skirts are popular, as these have a very pretty effect when swinging and are more comfortable to dance in than pants.Booking ahead (lining up a partner or partners ahead of time) cuts down the number of potential partners and is discouraged but is common at some of the larger dances