This might be called a "Mother Hubbard" night gown. It would be very warm if made of flannel and cool if made of a thin cotton damask, like the original. The fullness adds extra comfort.
The collar is made of a cotton eyelet. The same cotton eyelet trims the front and back yoke, the pocket, and creates the ruffle at the hem.
The leg 'o mutton sleeves were fashionable between 1893 and 1895 but could be seen in pattern drafting manuals for seamstresses into 1897.
The pattern is multi-sized 10 through 20. Purchase 7-1/8 Yds. of 45 inch wide cotton sheeting, cotton damask or cotton calico.