You have a pattern that calls for a DK weight, or Worsted weight, Lace weight, Sport weight or Super Fine, what is that size in relation to the Craft Yarn Council markings that are on commercially made yarns. These posted sizes (thicknesses) are using the Craft Yarn Council standard numbers 0, 1, 2
How does yarn weight work? + free cheat sheet!
A Beginner's Guide to Yarn Weights
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Bulky Weight Lacery Yarn 100g - 2 Skeins - 100% Cotton - Vapor
Yarn Weight? Your questions answered — Ohio Yarn
WORSTED WEIGHT: One skein of Knit Picks Swish worsted weight yarn; 100% Superwash Merino Wool; 50 grams for 110 yards ALL PURPOSE YARN: Swish Worsted
Knit Picks Swish Worsted Weight 100% Superwash Merino Wool Yarn Skein - 50 g (Haze Heather)
Determining Yarn Weights with Wraps Per Inch
YARN TALK: Finding the right yarn for YOU