This video crochet tutorial will help you learn how to crochet the dutchess lace stitch.
Foundation Chain: Multiples of 3 + 1
Prep Row: [2 dc, ch 3, 1 Sl st] in 4th ch from hook, *skip next 2 ch, [2 dc, ch 3, 1 Sl st] in next ch; rep from across, turn
Row 1: Ch 3, *[2 dc, ch 3, 1 Sl st] in next xh-3 space; rep from * across, 1 dc in top of turning ch, turn
Row 2: Ch 3, *working in each ch of the ch-3 of previous row, 1 dc in first ch, 1 dc in 2nd ch, ch 3, 1 Sl st in 3rd; rep from * across, end 1 dc in top of the turn ch, turn
Repeat rows 1 – 2 until you have reached your desired length.
After a few repeats your pattern should look like this: