A single-color version of the Herringbone pattern that appears in Nancy Marchant’s Knitting Fresh Brioche*.
The scarf shown in the swatch photos was knit in Hazel Knits Lively DK in Splish Splash, on 4mm needles, over 30 stitches. One skein made a scarf just over 3' 10" long.
*Affiliate link. Buy the book and I get a couple pennies.
Shown with a cast-on count of 22 stitches.