💙Crochet Mermaid Crop Top Beginner Tutorial

🌟 Introduction

Embrace summer vibes with the stylish and comfortable Azure Ribbed Halter Crop Top! This pattern creates a flattering, form-fitting top featuring beautifully molded cups with a subtle vertical ribbing, a snug underbust band, and a simple tie-up halter neck. Perfect for festivals, beach days, or layering, this top is a fun and rewarding project for those ready to tackle shaping in crochet.

Skill Level: Intermediate

Finished Size: Small (Bust Size 32-34 inches). Instructions for adjusting size are included in the ‘Tips & Customization’ section.


🧵 Materials & Gauge

✨ Materials Needed

  • Yarn: Approximately 200-250 yards of DK Weight (Light Worsted/8-ply) cotton or a cotton blend yarn. Cotton is recommended for breathability and stitch definition in garments. (The sample image uses a lovely azure blue.)
  • Hook: Size G/6 (4.0 mm) crochet hook, or size needed to obtain gauge.
  • Notions: Stitch markers (at least 2), yarn needle for weaving in ends, and scissors.

📏 Gauge (Crucial for Sizing!)

  • Cup Ribbing: 10 HDC BLO rows should measure approximately 2 inches (5 cm) tall.
  • Cup Width: 15 HDC BLO stitches should measure approximately 3 inches (7.5 cm) wide.
  • Underbust Band: 4 rows of HDC should measure 1 inch (2.5 cm) tall.

Important: Take your time to check gauge, especially for garments, as it directly impacts the finished size!


💡 Special Stitches & Abbreviations

📝 Pattern Abbreviations (US Terms)

| Abbreviation | Meaning | | Abbreviation | Meaning | | :—: | :— | :—: | :— | | ch | chain | | st(s) | stitch(es) | | sl st | slip stitch | | rep | repeat | | sc | single crochet | | inc | increase (work 2 sts into 1 st) | | hdc | half double crochet | | hdc2tog | half double crochet 2 together (decrease) | | dc | double crochet | | BLO | Back Loop Only | | MR | Magic Ring | | sk | skip |

⭐ Special Stitches (Written Instructions)

  • HDC BLO (Half Double Crochet Back Loop Only): Yarn over, insert hook into only the back loop of the specified stitch, yarn over, pull up a loop (3 loops on hook), yarn over, pull through all 3 loops. This creates the vertical ribbing on the cups.
  • HDC2tog (Half Double Crochet 2 Together – Decrease): Yo, insert hook into first st, yo, pull up loop (3 loops on hook). Insert hook into next st, yo, pull up loop (4 loops on hook). Yo, pull through all 4 loops.

👙 The Pattern: Azure Ribbed Halter Crop Top

Note: The pattern starts with one cup, then the second cup, which is joined to the first, and then the body is worked across both.

Part 1: The Cups (Make Two Identical)

The cups are worked in rows to create vertical ribbing and shaped with increases.

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Cup A:

Foundation: Ch 16 (adjust for desired cup height; this is for a B/C cup).

Row 1: Hdc in the 2nd ch from the hook, hdc in each ch across. Ch 1, turn. (15 hdc)

Row 2 (HDC BLO): Hdc BLO in each st across. Ch 1, turn. (15 hdc)

Row 3 (Increase Row): Hdc BLO in the first st, 2 hdc BLO in the next st (inc made). Hdc BLO in each st until the last 2 sts. 2 hdc BLO in the second to last st (inc made). Hdc BLO in the last st. Ch 1, turn. (17 hdc)

Row 4 (No Increase): Hdc BLO in each st across. Ch 1, turn. (17 hdc)

Rows 5-14: Repeat Rows 3 & 4 five more times. Your stitch count will increase by 2 sts every other row. After Row 14, you should have 27 hdc.

Row 15 (Final No Increase Row): Hdc BLO in each st across. Ch 1, turn. (27 hdc)

Do NOT fasten off Cup A. Keep the loop on your hook.


Part 2: Joining Cups and Underbust Band

Now we’ll create the second cup and join it, then work the body.

Cup B:

Repeat Rows 1-15 exactly as for Cup A. Do NOT fasten off Cup B.

Joining the Cups:

  1. Place Cup A (with working loop) and Cup B side by side, so the wider edges are at the bottom. The open edge from Row 15 of Cup B should be next to the open edge from Row 15 of Cup A.
  2. With working loop from Cup B, sl st into the first st of Cup A at the bottom/outer edge. This joins the inner corners.
  3. Ch 1, turn. You are now ready to work along the bottom edge of both cups.
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Round 1 (Underbust Band Foundation):

  • Work 1 sc in the side of each row of Cup A (there are 15 rows, so 15 sc).
  • Work 3 sc into the joined center (this creates a slight dip and reinforces the center).
  • Work 1 sc in the side of each row of Cup B (15 sc).
  • Ch 2 (creates a turning chain that will allow you to work back and forth for the band), turn. (33 sc total)

Round 2 (Underbust Band – HDC): Hdc in the first sc and in each sc across. Ch 2, turn. (33 hdc)

Round 3: Hdc in the first hdc and in each hdc across. Ch 2, turn. (33 hdc)

Repeat Round 3 until the band reaches your desired length (e.g., 8-10 rows total from the top of the cups). This creates a fitted band below the bust. The sample image shows about 8-10 rows.

Final Underbust Edging (Optional Scallop):

  1. Ch 1, turn.
  2. Sc in the first st. Sk 1 st, (dc, ch 1, dc) in the next st. Sk 1 st, sc in the next st. Rep from * across.
  3. Fasten off and weave in ends.

Part 3: The Halter Neck Straps

We will now create the straps that tie around the neck.

  1. Attach yarn with a sl st to the top-outer corner of Cup A (the narrower top edge of the cup).
  2. Ch 70-80 (adjust for desired strap length; typically, 20-25 inches).
  3. Sl st back into the 2nd ch from hook and in each ch back down the strap. Sl st into the cup to secure.
  4. Fasten off.
  5. Repeat steps 1-4 for the top-outer corner of Cup B.

Part 4: Back Ties (Optional)

If you prefer a tie-back instead of buttons/zipper, you can add long chains to the bottom of the underbust band.

  1. Attach yarn with a sl st to the bottom-outer corner of the underbust band on one side.
  2. Ch 80-100 (adjust for desired tie length).
  3. Sc back down the chain, starting in the 2nd ch from hook. Sl st into the band to secure.
  4. Fasten off.
  5. Repeat steps 1-4 for the other side of the underbust band.

Video Tutorial:


✂️ Finishing & Customization

📏 Sizing Adjustments

  • Cup Size:
    • Smaller Cup (A/B): Start with Ch 12-14. Repeat Rows 3 & 4 fewer times.
    • Larger Cup (C/D+): Start with Ch 18-20. Repeat Rows 3 & 4 more times until the cup width is sufficient, ensuring an odd number of stitches for the increase pattern.
  • Band Circumference: To adjust the overall circumference of the top, you will adjust the starting chain in Round 1 of the Underbust Band Foundation. You need to calculate how many sc you need for your desired total circumference. This pattern has 33 sc. For a larger size, you might need 40, 45, etc.
  • Top Length: Add or subtract rows from the Underbust Band (Part 2, Rounds 2-3 repetition).

🧺 Care Instructions

  • Gently hand wash in cold water with a mild detergent.
  • Lay flat to dry, reshaping the top to its original dimensions. Do not hang, as it may stretch.

Congratulations! You’ve created a beautiful and unique Azure Ribbed Halter Crop Top perfect for warm weather and showing off your crochet skills!

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