A yarn wig is a costume wig, not an everyday hair replacement. That is its charm. It can be bold, soft, cartoonish, heavy, and very forgiving for beginners.
What you need
Use one or two skeins of yarn, a fitted beanie or cap base, scissors, needle and thread, and a measuring board or book to wrap yarn around. For longer wigs, choose lighter yarn so the cap does not pull backward.
Make the yarn hair
Wrap yarn around a board, cut one side, and group the strands into wefts. Sew the wefts onto the cap in rows from the nape upward. Keep the top rows closer together so the cap does not show.
Style after sewing
Trim the ends, braid sections, add bangs, or tie half the yarn back. For character wigs, exaggerated shape matters more than realism.
Bottom line
To make a yarn wig, sew yarn wefts onto a fitted cap and style the shape after the cap is covered. It is one of the easiest DIY wig projects because perfection is not required.