Below, I put together a heavily photo laden tutorial on how to make these cute coasters; but if you just want the quick pattern, here it is:

Note: This pattern is worked in rows with an edging and a surface crochet detail for strap; ch 1 and turn at the end of each row except last.

With a G hook, ch 9
Row 1: sc in 2nd ch from hook, sc in ea ch across (8 sc)
Row 2: 2 sc in 1st st, sc in next 6 sts, 2 sc in last st (10 sc)
Row 3: 1 sc in ea st across (10 sc)
Row 4: 2 sc in 1st st, 1 sc in next 8 sts, 2 sc in last st (12 sc)
Row 5: 2 sc in 1st st, 1 sc in next 10 sts, 2 sc in last st (14 sc)
Row 6: 1 sc in ea st across (14 sc)
Row 7: 2 sc in 1st st, 1 sc in next 12 sts, 2 sc in last st (16 sc)
Row 8 & 9: 1 sc in ea st across (16 sc)
Row 10: sc2tog, 1 sc in next 12 sts, sc2tog (14 sc)
Row 11: sc2tog, 1 sc in next 10 sts, sc2tog (12 sc)
Row 12: 1 sc in ea st across (12 sc)
Row 13: sc2tog, 1 sc in next 8 sts, sc2tog (10 sc)
Row 14: sc2tog, 1 sc in next 6 sts, sc2tog (8 sc)
ch 1, do not fasten off, do not turn

Work edging to the left around the coaster in the row ends and between rows as follows:
Left side: (1 sc in next sp, 2 sc in next sp) 6 times, 1 sc in last row end (19 sts)
Lower left corner: 2 sc in first unused loop of foundation chain
Bottom: 1 sc in next 6 unused loops of foundation chain
Lower right corner: 2 sc in last unused loop of foundation chain
Right side: (1 sc in next sp, 2 sc in next sp) 6 times, 2 sc in last row end (20 sts)
Top: 1 sc in ea st across top (8 sts)
skip ch at beginning of edging and sl st to 1st sc of edging
fasten off

Straps: Change color and switch to a size H crochet hook. Eyeball the center of the strap and surface crochet down and to the left for the left side of the strap; cut yarn and begin again at the right edge, surface crocheting up and toward the center for the right side of the strap until they meet, leave a bit longer tail for the center detail. Thread the tail on a blunt needle and sew two long stitches, stopping just below the top edge of the flip flop. Fasten off and weave in all ends at the back.

Below is the super long photo tutorial…

You’ll need two contrasting yarns (I used Lily cotton Sugar and Cream), and two hooks – G for the main part and H for the straps, plus scissors and a large eye blunt needle

With a G hook, chain 9

Row 1: sc in 2nd ch from hook, sc in ea ch across (8 sc)

Ch 1 at the end of each row before you turn

Row 2: 2 sc in 1st st

sc in next 6 sts, 2 sc in last st (10 sc)

Row 3: 1 sc in ea st across (10 sc)
Row 4: 2 sc in 1st st, 1 sc in next 8 sts, 2 sc in last st (12 sc)
Row 5: 2 sc in 1st st, 1 sc in next 10 sts, 2 sc in last st (14 sc)
Row 6: 1 sc in ea st across (14 sc)
Row 7: 2 sc in 1st st, 1 sc in next 12 sts, 2 sc in last st (16 sc)
Rows 8 & 9: 1 sc in ea st across (16 sc)

This is the widest part of the project; the rest will be decreasing

Row 10: sc2tog

1 sc in next 12 sts, sc2tog (14 sc)

Row 11: sc2tog, 1 sc in next 10 sts, sc2tog (12 sc)
Row 12: 1 sc in ea st across (12 sc)
Row 13: sc2tog, 1 sc in next 8 sts, sc2tog (10 sc)
Row 14: sc2tog, 1 sc in next 6 sts, sc2tog (8 sc)

ch 1, do not fasten off, do not turn

Work edging to the left around the coaster in the row ends and between rows as follows:
Left side: (1 sc in next sp, 2 sc in next sp) 6 times, 1 sc in last row end (19 sts)

Lower left corner: 2 sc in first unused loop of foundation chain

Bottom: 1 sc in next 6 unused loops of foundation chain

Lower right corner: 2 sc in last unused loop of foundation chain

Right side: (1 sc in next sp, 2 sc in next sp) 6 times, 2 sc in last row end (20 sts)

Top: 1 sc in ea st across top (8 sts)

skip ch at beginning of edging and sl st to 1st sc of edging

fasten off

Now let’s make the straps

Begin at the center of the strap and work the left side of the strap from center out toward the left edge of the flip flop.
With yarn at the back of the project and hook at the front, insert hook through a space that is approximately in the middle of the flip flop and three rows down from the top.

Pull yarn up through the flip flop so the hook is at the front with one loop on the hook.

Next, insert the hook from front to back in the next space that is approximately one space down and to the left of the first.

Yarn over and pull the loop up to the front of the project.

Continue pulling the hook through the first loop on the hook.

Continue the process until you’re at the left edge.

Cut yarn, leaving a short tail to weave into the back of the flip flop.

For the right side of the strap, begin at the right edge of the flip flip.

Work with the same process as for the left, but this time, work upward and toward the center as you go and end so that the right and left straps meet at the center.

Leave a tail about six inches long.

For the between the toe part of the flip flop, thread the six inch tail of the right side strap onto a blunt needle.

Insert it down through a center space about two rows above the center of the strap.

Sew two of those stitches.

Weave the tail into the back of the flip flop and trim.

Enjoy!