If you are working with Third Scale Blocks to do patternmaking exercises, it is useful to have a Third Scale Ruler to use with them.
For the purposes of learning patternmaking principles, making patterns at a 1/3 scale saves paper and requires less desk space than making them full-scale. If you attend face-to-face classes in patternmaking, you generally make most patterns at one-third scale.
Click on this link to go to the Third Scale Blocks Page to download the Third Scale Blocks booklet which contains: Bodice Front and Back, Sleeve, Skirt Front & Back, Pants Front & Back.
You will need some cardboard to make the final blocks that you use to do the exercises.