Tools & Equipment
Tailor’s Chalk is used on fabric to mark darts and other markings before assembly, and also on the toile to mark alteration fitting and adjustment lines.
It can also be used on the actual garment to mark darts and other construction guides.
When making toiles for myself, I often use felt-tipped pens to mark these lines for a variety of reasons. Although this may be a no-no for professional patternmakers and sewers, for the home sewer just trying to make their own blocks and toiles, it can make life a lot easier.