noun
conspicuous thread mark; thread used to make seams stand out
A thread sewn into fabric to make seams or stitching lines clearly visible, often used in tailoring or decorative work.
仮縫いのときに糸印を使って、本縫いの位置をわかりやすくする。
When basting, use a conspicuous thread to make the final stitching line easy to see.