The first outfit of Elizabeth's that we see in the first scene, this blue spencer is seen throughout the miniseries. It is always paired with a white dress, but there are two different bonnets that are worn with this spencer. I would say that this spencer seems to be worn during cooler summer days/warmer autumn days.
Front/Partial Side View: There seem to be three parts to the sleeve: the main. long sleeve, a shorter sleeve that goes on top, and lastly the zig-zag decoration that goes on top of the short sleeve.
Back Views: Looks similar to how Regency era dresses look in the back with the back piece.
Close up of the front: I included this picture so you could see the buttons that were hidden behind the bonnet ribbon.