"The chaise, its calash"

A chaise was a light-weight horse-drawn carriage designed to carry one or two people.  A calash was a folding hood that could be drawn down over the seats in the chaise, as shown in the illustration below.  The carriage in this illustration does not have a box, which is a seat for the coachman, usually but not always between the passengers and the horses.

Illustration of a chaise with calash, by Pearson Scott Foresman
Public DomainIllustration of a chaise with calash, by Pearson Scott Foresman