If undergarment is worn, insert a core of collar only in the undergarment Eri, match the Sechushin seams of the outer garment and the undergarment and stitch them together a little, match the collar ends of the outer garment and the undergarment and stitch them together at where Eri are sewn to the garments.
重ね着の場合は下着の襟だけを入れ、上下の背縫いを合せて1針留め、襟先も重ねて襟の付け根を1針留める。