pipeclay used by tailors and dressmakers to mark seams, darts, etc, on material
tailor's chalk in American English
noun
hardened chalk or soapstone used to make temporary guide marks on a garment that is being altered
Word origin
[1880–85]This word is first recorded in the period 1880–85. Other words that entered Englishat around the same time include: automatism, barnstorm, quotation mark, rain check, regionalism
Examples of 'tailor's chalk' in a sentence
tailor's chalk
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You see your beautiful suit deconstructed, the tailor's chalk lines, the unsecured seams.
Times, Sunday Times (2013)
I even thought about buying some tailor's chalk (3.75), only to find it for 80p on the net.
Times, Sunday Times (2015)
Once you're happy with the length, take the trousers off and mark with chalk (ideally tailor's chalk) along the fold line.