This is a Court cap whose koji and ei were fixed together with a clip called koji-gami which was made with gold foil-covered, two-ply danshi (fine crepe paper) with a square hole on its center.
中心に四角く穴を開けた檀紙二枚を重ねて金箔を張った巾子紙（こじがみ）と呼ばれる留め具に、巾子ごと纓を挟んだもの。