Cozy Denim Diamond Cardigan: Easy DIY Crochet Pattern

There is something undeniably satisfying about draping a finished crochet cardigan over your shoulders, feeling the weight of the denim-blue cotton, and admiring the way the light catches the open diamond lattice. This project is the kind of wearable art that makes you want to show it off immediately—it is cute, useful, and undeniably display-worthy. The contrast between the structured upper mesh and the airy lower lattice creates a silhouette that is both flattering and visually striking, making it a perfect piece for layering over simple tops.

Why the Finished Piece Stands Out

What truly elevates this cardigan is the thoughtful interplay of textures and the modern color palette. The denim blue main color paired with the soft pale blue trim gives the garment a polished, contemporary look that feels fresh yet timeless. The design features a boxy silhouette with dramatic balloon sleeves that gather into fitted ribbed cuffs, creating a lovely puffed shape without the need for complicated shaping techniques. This combination of dense small mesh on the upper body and open diamond lattice below provides visual interest while remaining comfortable to wear. It is a project that rewards patience with a high-end finish, perfect for anyone looking to add a statement piece to their handmade wardrobe.

Project Overview

This is a cropped open-front cardigan with a boxy silhouette and dramatic balloon sleeves. The construction is straightforward: work three flat panels from the shoulders down, join them, add the sleeves, then finish with contrasting pale blue ribbed cuffs and front bands. If you can double crochet and chain, you have the skills for this project. The mesh and lattice stitches are repetitive once established, making this a relaxing project after the first few rows of each section.

Materials

Yarn

• Main color (denim blue): 500 g / 1100 m of smooth DK weight cotton blend, approximately 220 m per 100 g
• Contrast color (pale blue): 100 g / 220 m total for bands and cuffs

Hooks

• 4 mm hook for main fabric (or size needed to meet gauge)
• 3.5 mm hook for cuffs and trim

Notions

• Tapestry needle
• 8 stitch markers
• Measuring tape
• Scissors

Optional for Pearl Version

• 12 sew-on imitation pearls
• Strong sewing thread

Gauge and Finished Size

Getting gauge right matters here because you are working two different fabric textures that need to match up at the transition row. Cotton lace tends to lengthen while worn, so all dimensions in this pattern are blocked targets.

• Small mesh gauge: 16 stitch positions (8 cells) x 10 rows = 10 cm square
• Large lattice gauge: 4 arches x 10 rows = 10 cm square, lightly blocked

Make a swatch at least 15 x 15 cm in each stitch pattern. Wash and dry the swatches as you plan to care for the finished garment, then measure the central 10 cm without stretching. Change hook size if needed. Record both width and height measurements.

Finished Measurements

• Body coverage: approximately 102 cm (about 40 inches) around
• Fits bust: 88 to 94 cm (about 35 to 37 inches) with 8 to 14 cm ease
• Body length: approximately 54 cm (about 21 inches)
• Sleeve length: approximately 42 cm (about 16.5 inches) including cuff
• Back width: approximately 51 cm (about 20 inches)
• Each front panel: approximately 26 cm (about 10 inches)

This pattern provides one adult size only. Check the measurements against your body before beginning. Altering stitch counts requires recalculating the lattice placement and shaping.

Abbreviations

This pattern uses US crochet terminology throughout.

• ch = chain
• st(s) = stitch(es)
• sp = space
• sl st = slip stitch (insert hook, yarn over, pull through stitch and loop on hook in one motion)
• sc = single crochet (insert hook, yarn over, pull up loop, yarn over, pull through both loops)
• hdc = half double crochet
• dc = double crochet (yarn over, insert hook, yarn over, pull up loop, [yarn over, pull through 2 loops] twice)
• tr = treble crochet
• BLO = back loop only (insert hook under only the back loop of the stitch)
• RS/WS = right side / wrong side
• rep = repeat
• inc = increase
• sc2tog = single crochet two stitches together (a decrease)

Pattern Notes

• Turning ch 3 counts as a dc
• Ch 1 does not count as a sc
• Join rounds with sl st unless stated otherwise
• Flat rows turn after each row
• Brackets [ ] enclose a repeat
• Do not count joining sl sts in your stitch totals
• Sew with RS together unless directed otherwise
• Work main fabric in denim blue; use pale blue for trims and cuffs

This is an adult garment. Open mesh does not provide sun protection or opaque coverage. If adding pearls or other embellishments, attach them securely and inspect before each wear. Beads and appliques can be snagging hazards.

Special Stitches

Small Mesh Stitch (Flat)

Ch 3 (counts as first dc), [ch 1, skip next ch-1 sp, dc in next dc] to end of row. Work the dc into the post of the stitch, not into the gap. A mesh cell is one ch-1 space bounded by dc posts on either side. For flat work with C cells, you will have C+1 dc posts and C chains, giving you a total of 2C+1 stitch positions.

Large Lattice Foundation

Ch 1, sc in first dc; [ch 5, skip next mesh cell and its following cell, sc in their ending dc post] across. Each arch spans 4 old stitch positions and ends on every second old dc post. Back panel: 20 arches. Each front panel: 10 arches.

Offset Lattice Row

Ch 5 (counts as edge dc + ch 2), sc in first old arch; [ch 5, sc in next old arch] to last arch; ch 2, dc in last edge sc (or third chain of prior turning ch-5). Turn. Count the two edge half-arches together as one arch.

Return Lattice Row

Ch 1, sc in first dc; [ch 5, sc in next full arch] across, then ch 5, sc in last edge dc. Turn. These two rows alternate throughout the lattice sections.

Shell Trim (Optional)

On a prepared sc edge with a multiple of 6 stitches: [skip 2 sc, 5 dc in next sc, skip 2 sc, sl st in next sc].

Picot Trim (Optional)

[Sc in next 3 sts, ch 3, sl st into third ch from hook].

Pattern Instructions

Back Panel

Row 1: Ch 84; dc in sixth ch from hook, [ch 1, skip 1 ch, dc in next ch] 39 times; turn. (40 cells; 41 dc + 40 ch-1 spaces)

Rows 2 through 30: Work small mesh across; turn. (40 cells)

Row 31: Work large-lattice foundation; turn. (20 arch equivalents, counting two edge halves as one)

Rows 32 through 54: Alternate offset lattice rows and return lattice rows with plain sc anchors. Turn after each row. (20 arch equivalents throughout)

Checkpoint: Back length should measure approximately 54 cm; width approximately 51 cm. Do not block lower lace wider than upper grid.

Left Front Panel

Row 1: Ch 28; dc in sixth ch from hook, [ch 1, skip 1 ch, dc in next ch] 11 times; turn. (12 cells; 13 dc + 12 ch-1 spaces)

Mark the neck edge. The neck edge is at the start of Row 2 for the left front. Keep the opposite armhole edge straight throughout.

Rows 2 through 9: Work small mesh, increasing one cell at the marked neck edge only; turn. You will add one cell per row. (Row 2: 13 cells, Row 3: 14 cells, continuing until Row 9: 20 cells)

To increase at row start: ch 3, then (ch 1, dc) in the first dc. To increase at row end: add (ch 1, dc) in the last dc.

Rows 10 through 30: Work small mesh across; turn. (20 cells)

Row 31: Work large-lattice foundation; turn. (10 arch equivalents)

Rows 32 through 54: Alternate offset lattice rows and return lattice rows with plain sc anchors. Turn after each row. (10 arch equivalents throughout)

Checkpoint: Left front length approximately 54 cm; width approximately 26 cm.

Right Front Panel

Work as for Left Front, but the neck edge is at the end of Row 2 rather than the start. All other instructions remain the same.

Checkpoint: Right front length approximately 54 cm; width approximately 26 cm.

Sleeves (Make 2)

Work from upper arm down.

Row 1: Ch 84; dc in sixth ch from hook, [ch 1, skip 1 ch, dc in next ch] 39 times; turn. (40 cells)

Row 2: Work large-lattice foundation; turn. (20 arches)

Rows 3 through 37: Alternate offset lattice rows and return lattice rows. Turn after each row. (20 arch equivalents throughout)

Ribbed Cuffs (Make 2)

Using 3.5 mm hook and contrast color:

Row 1: Ch 11; sc in second ch from hook and each remaining ch; turn. (10 sc)

Rows 2 through 40: Ch 1, sc BLO in each st; turn. (10 sc)

Cuff target: approximately 5 cm deep x 20 cm around before joining. Adjust row count only if needed to pass comfortably over the hand. Record your actual count for the matching second cuff.

Assembly

Shoulder Seams

At each side, join the outer 12 front mesh cells to the outer 12 back mesh cells along the foundation edge. Leave the center 16 back cells unseamed for the neck opening. The front neck shaping remains open. (2 shoulder seams, 12 cells each)

Side Seams

Mark 25 cm down from shoulder on both back and corresponding front panels. Sew body sides from hem to markers, leaving the armhole openings. (2 armholes, approximately 50 cm circumference each)

Attach Sleeves

Sew each sleeve lengthwise to form a tube. Place the sleeve seam at underarm, match the sleeve-top midpoint to the shoulder seam, and sew the top edge evenly into the armhole.

Attach Cuffs

Join cuff first and last rows into a ring using sl st or whipstitch. Quarter-mark both the cuff and the sleeve opening. Whipstitch cuff to sleeve while gathering the sleeve fabric evenly. Do not stretch the cuff beyond comfortable hand circumference.

Checkpoint: Shoulders should sit evenly. Sleeves move comfortably. Front edges remain open. Adjust seam tension before trimming yarn tails.

Edgings and Details

Using contrast color and 3.5 mm hook:

Border Round 1: Join at one lower front corner. Sc evenly around entire open-front, neck, and hem outline. Use these guidelines: 2 sc per dc row end, 1 sc per foundation position, 4 sc per complete lower-lattice arch (2 per edge half-arch), and 3 sc at each outward corner. Record your total stitch count (B) and mark the middle corner stitches.

Border Round 2: Sc in each st, placing 3 sc in each marked corner st. Move markers to new middle corner stitches. (B + 2K sc, where K = number of corners)

Border Round 3 (optional for wider band): Repeat Round 2. (B + 4K sc)

For shell-edged versions, add shell trim along lower hem and sleeve openings using complete 6-st repeats. Finish any remainder in sc.

For picot versions, add picot trim along hem. Keep front and neck edge plain to avoid curling.

Checkpoint: Front bands lie flat. Hem does not flare unintentionally. Cuffs pass over hands and recover their shape.

Finishing

Weave every yarn end through at least 5 cm of fabric, reverse direction, and trim.

Wet-block flat, aligning side seams and matching sleeve lengths. Pin lace to the upper-panel width rather than stretching it wider.

Final measurements: Body length approximately 54 cm, sleeves approximately 42 cm including cuffs, total body coverage approximately 102 cm. Recheck after drying and again after a short wear.

Care Instructions

Follow your yarn label for specific guidance. For most DK cotton blends:

• Hand-wash cool with mild detergent
• Support the wet fabric to prevent stretching
• Dry flat away from direct heat
• Do not wring, tumble dry, or iron acrylic components

Tips

• Getting gauge right matters here because you are working two different fabric textures that need to match up at the transition row.
• Cotton lace tends to lengthen while worn, so all dimensions in this pattern are blocked targets.
• Do not block lower lace wider than upper grid.
• Adjust row count only if needed to pass comfortably over the hand. Record your actual count for the matching second cuff.
• Do not stretch the cuff beyond comfortable hand circumference.
• Adjust seam tension before trimming yarn tails.
• Keep front and neck edge plain to avoid curling.
• Pin lace to the upper-panel width rather than stretching it wider.
• Recheck after drying and again after a short wear.

FAQs

What yarn weight should I use for this cardigan?

The pattern calls for a smooth DK weight cotton blend. This weight provides enough structure for the mesh stitch while remaining breathable for the lattice sections.

Can I make this cardigan in a different size?

This pattern provides one adult size only. Altering stitch counts requires recalculating the lattice placement and shaping, so it is recommended to stick to the provided measurements for the best fit.

How do I prevent the cuffs from being too tight?

Adjust the row count for the cuffs only if needed to pass comfortably over the hand. Record your actual count for the matching second cuff to ensure symmetry.

Is this pattern suitable for beginners?

This pattern suits confident beginners and intermediate crocheters. You should be comfortable with working flat rows, double crochet, single crochet, increasing at row edges, basic seaming, and working in back loop only.

How should I block the finished cardigan?

Wet-block flat, aligning side seams and matching sleeve lengths. Pin lace to the upper-panel width rather than stretching it wider, as cotton lace tends to lengthen while worn.