This is a Komon
Kimono with chic Tagasode( kimono of somebody ) pattern, which is dyed.
Classical 'karabana' (imaginary flower in china) are also designed.
Textile is silk, and it has soft touch.
Collar is hiro-eri (unfolded).
Stains B on chest area may blend in with the pattern, but stains C on the back and left front panel may be noticed.
Both outside and lining fabrics are slightly discolored.
Please see photos for details.
If you do not mind the flaws mentioned, it can continue to be worn.