This is a dignified Oshima Tsumugi
kimono and with hana-bishi(flower diamond ) and kiku(chrysanthemum) pattern, which are woven vibrantly.
Textile is exquisite silk, it is soft and smooth, which is the feature of Oshima Tsumugi
Lapel is hiro-eri (wide lapel).
Besides prominent stains(E) on the left front, slight discoloration and molds can be seen as well.
For the details, please refer to the photos and the sheet.
It's difficult to determine if this is wearable as formal or not because of the noticeable stains on the left front, but it is still a valuable piece to enjoy.