This stitch pattern looks intricate, but it's way less complicated than it looks at first glance.
I recommend this stitch to any crocheter who has mastered the single crochet stitch, to the point of not having any problems with maintaining an even tension.
Here's How to Crochet This Stitch:
Start with one yarn and one crochet thread that are drastically different sizes. For the swatch pictured here, I used Star Pearl Twist mercerized cotton crochet thread in size 8, paired with worsted weight Lily Sugar 'n' Cream kitchen cotton.
Using the heavier yarn, crochet a series of chain stitches to serve as a starting chain.
Row 1: Work the entire row in single crochet stitch.
Row 2: Work the entire row in front loop single crochet stitch, which is exactly the same as single crochet except that you work through the front loops only. Before you complete the last step of the last stitch in the row, change to the finer weight thread.
Rows 3-4: Use the thread to work 2 more rows of front loop single crochet stitch. Before you complete the last step of the last stitch, change to the heavier yarn.
Continue crocheting two rows using the heavy yarn, then two rows of the finer weight thread, etc, until the piece is the length you want it to be.
Do not change crochet hooks when you switch yarns; you want to use the same crochet hook throughout. Choose a hook that's a comfortable size for crocheting with the heavier yarn.
Use a loose, easy tension throughout the piece. Try not to tighten up when you work your stitches in the finer thread; you don't want your stitches to pull in, and you don't want your piece to become distorted.
Try Crocheting a Project in a Similar Stitch Pattern:
This easy thick and thin scarf is crocheted using the same basic idea, although I worked the sample scarf in single crochet rather than front loop single crochet.