Obiage, Obijime, and Kasane-eri 3-piece set for Coming-of-Age ceremonies, graduation ceremonies, and hakama outfits - Black and Gold

Obiage, Obijime, and Eri (collar) set of three items.

This set was purchased for a coming-of-age ceremony furisode, but I am listing it for sale as I will not be using these three items.

Obiage:
Burnt brown and gold

Obijime:
Black base with gold and pink.
Pearl embellishments add a festive touch.

Eri (collar):
Combination of black and gold.
Reversible, can be used on either side.

Unfortunately, I do not know the materials.
The previous owner stated it was used twice.
I have not used it.
I would like to sell this to someone who understands this.

Thank you for looking.