Gisela was engaged in 1888 and married in 1890; I do not know the date of the engagement party.
From pinterest.com/bookwoman15/royal-fashion/.jpg.
The upturned sleeves are an indicator of the time around 1890. The sleeves may be encased in lace.
Keywords: 1888, Elisabeth of Bavaria, Sissi, Sisi, Wittelsbach family, Habsburg family, Empress, Austrian, partlet, high enclosing neckline, bodice, sweetheart neckline, long close sleeves, cuffs, waist band, shallow vee waistline, close skirt, lace over-skirt