Chain multiple: 7 + 4

Stitch Guide

Front-post double crochet (FPdc): YO, insert hook from front to back to front around post (vertical bar) of specified dc, YO and draw up a lp; (YO and draw through 2 lps on hook) twice; FPdc made.

Back-post double crochet (BPdc): YO, insert hook from back to front to back around post (vertical bar) of specified dc, YO and draw up a lp; (YO and draw through 2 lps) twice: BPdc made.

Instructions

Row 1 (RS): Dc in 4th ch from hook and in each rem ch; ch 3, turn.

Row 2: Dc in each dc; ch 3, turn.

Row 3: Dc in next dc; FPdc around next dc; *sc in next dc, hdc in next dc, 3 dc in next dc; hdc in next dc, sc in next dc, FPdc around next dc; rep from * to last 2 dc, dc in last 2 dc; ch 3, turn.

Row 4: Dc in next dc; BPdc around next FPdc; *ch 3, sk next 3 sts, in next st work (sc, ch 3, sc); ch 3, sk next 3 sts, BPdc around next FPdc; rep from * to last 2 sts, dc in last 2 sts; ch 3, turn.

Row 5: Dc in next dc; FPdc around next BPdc; *sk next ch-3 lp, 7 dc in next ch-3 lp: shell made; sk next ch-3 lp, FPdc around next BPdc; rep from * to last 2 dc, dc in last 2 dc; ch 3, turn.

Row 6: Dc in next dc; BPdc around next FPdc, ch 1, sc in front lp only of 4th dc of next shell, ch 1, sk next 3 dc; *in next FPdc work (dc, ch 1, dc); ch 1, sc in front lp only of 4th dc of next shell, ch 1, sk next 3 dc; rep from * to last 3 sts, BPdc around FPdc, dc in last 2 dc; ch 3, turn.

Row 7: Dc in next dc; dc in BPdc, 2 dc in next ch-sp; *dc in sc, dc in ch-sp, (2 dc in next ch-sp) twice; rep from * across, end last rep with dc in sc, 2 dc in next ch-sp, dc in BPdc, dc in last 2 dc; ch 3, turn.

Rep rows 2-7 for patt.