On the Let’s Knit! Magazine website, this is available for free under the name “Sands Baby Blanket”

Overview: A square baby blanket knit on the diagonal in garter stitch, with optional lace border.

From designer:

This lace border makes the easy blanket, very special. Use the lace all around for a shawl, or on the top edge only for a crib or pram blanket. The blanket is our basic pattern. (You can use any wool and needles to suit, to give a soft drape) This pattern knits to approx. a 24” square. It will always come square so the size is up to you.

Note: This pattern is for limited non-commercial, educational and personal use only.

Yarn requirements only state that you need 200g of DK-weight yarn. Yardage estimate here based on several common brands of DK wool.