This is a Komon
Kimono with joyful brush stroke-like pattern in cosmic-like Bokashi 'ombre' base pattern, which is dyed. (maybe aurora?)
Fine silver threads are included in the fabric and they twinkle gently.
Textile is soft silk.
Wear on collar (A) is not disturbing as the base color is dark.
It has stains on lining.
Please see photos for details.
It has stain on left side of collar, but it will not show when folded and worn. (sorry no photos)
Its lining is slightly discolored due to the age.
If you do not mind the small flaws mentioned, it can continue to be worn.