Crochet Moon Bikini Pattern | Handmade Crochet Bikini | Boho Beachwear

There is something undeniably magical about wearing a piece of beachwear you made with your own hands. A handmade crochet bikini carries a kind of energy that store-bought swimwear simply cannot replicate — it’s personal, it’s creative, and it tells a story of patience and skill. The crochet moon bikini pattern has become one of the most beloved projects in the boho beachwear world, blending celestial-inspired texture with the free-spirited aesthetic that feels right at home on a sandy beach or at a summer festival. Whether you’re a seasoned crocheter or someone ready to take on a more adventurous project, this guide will walk you through everything you need to know — from materials and sizing to stitch-by-stitch instructions and styling tips.

Why Crochet Your Own Bikini?

Before diving into the pattern itself, it’s worth taking a moment to appreciate why handmade crochet bikinis have experienced such a remarkable surge in popularity. There are several very good reasons.

First, there’s the fit. Commercial swimwear is designed for an average body that doesn’t exist. Every person has a unique ratio of bust to waist to hip, and crochet is wonderfully accommodating. You adjust as you go. You can make the top cups larger or smaller, lengthen the ties, widen the bottoms — the level of customization is simply not possible when you’re pulling something off a rack.

Second, there’s the sustainability factor. Fast fashion has an enormous environmental footprint, and the swimwear industry is no exception. Most commercial bikinis are made from synthetic fabrics that shed microplastics with every wash. When you create your own crochet bikini from a natural or recycled cotton yarn, you’re stepping outside of that cycle entirely. Many crafters today specifically seek out organic cotton or recycled fiber options for their handmade beachwear.

Third, and perhaps most importantly, there’s the joy of making. Crochet is meditative. The rhythm of hook and yarn has helped countless people manage stress, anxiety, and the general noise of modern life. There is a particular satisfaction in showing up to the beach wearing something you built from a single length of yarn and a hook, stitch by stitch.

The crochet moon bikini pattern specifically resonates with people drawn to bohemian style — the layered jewelry, the flowy cover-ups, the sun-bleached aesthetic. Its name evokes the crescent and mandala shapes that often appear in its construction, and the finished piece has that distinctly handcrafted, artisanal look that pairs beautifully with everything from sarongs to high-waisted linen shorts.

Materials You’ll Need

Getting your materials right is half the battle when it comes to any crochet project, but it’s especially important for beachwear. You need a yarn that can handle sun, salt water, chlorine, and moisture without losing its shape or becoming uncomfortable against the skin.

Yarn: The most popular choice for crochet bikinis is a smooth, tightly twisted cotton yarn in a fingering or sport weight. Cotton is breathable, dries relatively quickly, and holds its shape well when wet. Look for 100% mercerized cotton for the smoothest finish and the best stitch definition. If you want to add a little stretch to your bikini, some crafters opt for a cotton-acrylic blend or a yarn that contains a small percentage of elastane. For a moon bikini pattern with crisp, defined motifs, mercerized cotton in a fingering weight (approximately 400–450 yards per 100g) works beautifully. You’ll typically need two to three skeins depending on your size.

Hook Size: A 2.5mm to 3.5mm crochet hook is typical for this weight of yarn. Start with a 3mm and adjust based on your gauge swatch. If your stitches are too loose and the fabric feels floppy, go down a size. If your work is too tight and stiff, go up.

Additional Notions: You’ll need a tapestry needle for weaving in ends, a pair of sharp scissors, stitch markers to keep track of rounds and pattern repeats, and a measuring tape. For the ties, you can either crochet them as part of the pattern or use a matching ribbon or cotton cord — both approaches work well.

Lining (Optional): Many crochet bikini patterns benefit from a lining, particularly for the bottom piece. A thin stretch fabric in a matching or complementary color adds modesty and prevents the crochet from pulling uncomfortably against the skin. You can find swimwear lining fabric at most fabric stores or online.

Sizing and Gauge

Before casting on a single stitch, please make a gauge swatch. It may feel tedious, but it will save you from the heartbreak of finishing a bikini top that’s several inches too small or too large.

For this pattern, work a 10cm x 10cm (4 x 4 inch) square in the primary stitch pattern — typically a simple mesh or shell stitch — using your chosen yarn and hook. Count the stitches and rows. The pattern is designed around a gauge of approximately 24 stitches and 28 rows per 10cm in single crochet, or roughly 20 stitches per 10cm in the shell/mesh pattern. Adjust your hook size until your swatch matches.

This moon bikini pattern is written for sizes XS through XL, with finished measurements as follows:

For the top, the key measurements are the band circumference (the stretch band that sits under the bust) and the cup depth. Band sizes range from approximately 28 inches (XS) to 40 inches (XL). The cups are designed to be adjustable — you work more or fewer rows depending on your cup size, which the pattern indicates clearly.

For the bottom, the key measurements are the hip circumference and the rise (the length from the top of the waistband to the crotch). Hip measurements range from approximately 32 inches (XS) to 44 inches (XL). The pattern uses tie sides to allow a generous range of adjustment.

Stitch Glossary

This pattern uses the following stitches. If any are unfamiliar, there are wonderful video tutorials available for each one.

Chain (ch): The foundational stitch of crochet.

Slip stitch (sl st): Used to join rounds and move the working yarn without adding height.

Single crochet (sc): A short, tight stitch that creates a dense, firm fabric.

Half double crochet (hdc): A slightly taller stitch that creates a flexible, medium-weight fabric — great for the band sections.

Double crochet (dc): A tall, open stitch used extensively in the shell and mesh motifs of this pattern.

Shell stitch: A classic cluster of 5 double crochets worked into the same stitch or space, creating a fan or shell shape. This is a central element of the moon motifs.

Picot: A decorative loop made by chaining 3 stitches and joining them at the base, used to finish edges with a delicate, lacy look.

Magic ring (or adjustable ring): Used to start motifs worked in the round, allowing the center to be pulled tight with no hole.

The Crochet Moon Bikini Top Pattern

Part One: The Moon Motifs

The distinctive feature of this bikini design is the pair of crescent or crescent-adjacent circular motifs that form the cups. Each cup is built from a central mandala-style circle that is then shaped through strategic increases and decreases to create the cup form.

For each motif, begin with a magic ring.

Round 1: Chain 3 (counts as first dc), work 11 dc into the ring, join with a sl st to the top of the beginning ch-3. Pull the ring tight. (12 dc)

Round 2: Chain 3, work 1 dc in the same stitch, work 2 dc in each stitch around, join with sl st. (24 dc)

Round 3: Chain 3, work 1 dc in the same stitch, 1 dc in the next stitch, 2 dc in next stitch, 1 dc in next stitch, repeat from to around, join with sl st. (36 dc)

Round 4: Chain 1, sc in each stitch around, join with sl st. (36 sc) — This round creates a firm, defined edge before you begin shaping.

Round 5 (Shell Round): Chain 1, skip 2 sc, work a shell of 5 dc in the next stitch, skip 2 sc, sc in the next stitch, repeat from to around. You will have 6 shells total. Join with sl st.

Round 6: Sl st into the top of the first shell (the middle dc of the 5), chain 3, work 4 dc in the same stitch (completing the first shell at the top), sc between shells (in the sc from the previous round), shell in the top of next shell, repeat around. Join with sl st.

Repeat Round 6 once more for a third shell round. You now have a lovely circular motif with three rows of shells radiating outward.

Part Two: Shaping the Cup

Now you will work flat (back and forth in rows rather than in rounds) to shape the lower half of each cup. This is where the “moon” shape comes from — you’re essentially creating a crescent by working only across part of the circle.

Identify the bottom third of your circular motif (the section that will face downward when worn). You will work across these stitches only.

Row 1: Attach yarn at the right edge of the bottom section. Chain 3, work dc across the bottom third of the motif (approximately 12 stitches). Turn.

Row 2: Chain 3, dc2tog at the beginning of the row (a decrease), dc across to the last 2 stitches, dc2tog. Turn. (2 stitches decreased)

Row 3: Repeat Row 2. Turn.

Row 4: Chain 1, sc across. This creates a firm bottom edge for the cup. Fasten off.

Repeat all steps to make a second motif, then set both aside.

Part Three: The Band

The band is what holds the entire top together and sits comfortably under the bust. It is worked flat in half double crochet for stretch and comfort.

Chain the number of stitches required for your size (refer to your gauge swatch to calculate the correct number for your band measurement — approximately 3 stitches per inch in hdc).

Row 1: Hdc in the second chain from hook and in each chain across. Turn.

Row 2: Chain 2 (does not count as a stitch), hdc in each stitch across. Turn.

Repeat Row 2 until the band measures 2.5 inches (approximately 6cm) in height. Fasten off, leaving a long tail for seaming.

Part Four: Assembling the Top

Place your two cup motifs along the top edge of the band, spacing them evenly. Using your tapestry needle and the long tail, whip stitch each motif to the band, making sure the flat (shaped) bottom edge of each cup aligns with the top edge of the band.

Once both cups are attached, join your yarn to one end of the band to begin working the ties and neck straps.

Neck Ties: Work a chain of approximately 80 stitches from the top inner corner of each cup, then sc back along the chain for a firm, neat tie. These long chains become the ties that fasten behind the neck in a halter style.

Band Ties: Work a chain of approximately 70 stitches from each end of the band. These tie at the back to secure the band around the body.

Finish all edges with a round of sc and optional picots for a polished, boho-beautiful look.

The Crochet Moon Bikini Bottom Pattern

The bottoms are worked from the center crotch panel outward, with tie sides for adjustability.

Part One: The Crotch Panel

Chain 16 (or adjust for comfort — approximately 3 inches wide).

Row 1: Sc in the second chain from hook and in each chain across. Turn. (15 sc)

Row 2: Chain 1, sc across. Turn.

Repeat Row 2 until the panel measures approximately 4 inches long. This forms the gusset.

Part Two: The Front Panel

From the top edge of the gusset, you will begin increasing outward to cover the front of the body.

Row 1: Chain 1, 2 sc in the first stitch, sc to the last stitch, 2 sc in the last stitch. Turn. (2 stitches increased)

Row 2: Repeat Row 1.

Continue increasing at each end of every row until the front panel reaches the desired width (approximately half your hip measurement) and the correct rise height for your size. This typically takes 8–10 increase rows.

Once you’ve reached the correct width, work 4–6 rows straight (no increases) for the waistband section. Work the last row in hdc for a slightly softer top edge.

Part Three: The Back Panel

The back panel begins from the bottom edge of the gusset and is worked the same way as the front panel but with slightly more width to provide coverage. Increase as for the front panel, working until the back panel is approximately 2 inches wider than the front at its widest point.

Work 4–6 rows straight for the back waistband.

Part Four: Ties

Work a chain of approximately 90 stitches from each side of the waistband (both front and back corners), then sc back along the chain. These four ties are gathered at each hip and tied in a bow.

Finish all edges with sc and picot trim to match the top.

Tips for Making Your Crochet Bikini Last

A handmade crochet bikini is a labor of love, and with a little care, it will last for many summers.

Always hand wash your crochet bikini in cool water with a gentle detergent. Avoid wringing or twisting — simply press the water out gently and lay flat to dry in the shade, since prolonged direct sun exposure can degrade both the yarn fibers and the color over time.

Before your first wear, consider treating the yarn with a light textile stiffener or a fabric conditioner designed for delicate items. This can help the stitches hold their shape when wet.

Rinse your bikini immediately after swimming, especially in salt water or chlorinated pools. Both salt and chlorine can weaken cotton fibers with repeated exposure if left to dry without rinsing.

Store your crochet swimwear flat or loosely folded rather than crumpled into a ball at the bottom of a beach bag. Taking a moment to treat it well between wears will keep it looking beautiful season after season.

Styling Your Boho Crochet Moon Bikini

Part of the joy of making your own beachwear is the total freedom to style it exactly as you want. The crochet moon bikini works beautifully with a wide range of boho beach looks.

Pair it with a flowing sarong in a warm terracotta or dusty rose for a sunset beach walk. Layer it under a loose linen shirt left unbuttoned for a relaxed boardwalk lunch look. Add a wide-brimmed straw hat, some hammered gold jewelry, and a woven tote bag and you have the quintessential boho beach goddess aesthetic.

For festival styling, the moon bikini works brilliantly as a top on its own, tucked into high-waisted denim shorts or a long printed skirt. Layer several necklaces at different lengths, add some braided hair accessories, and the crochet texture ties the whole look together.

In terms of color, natural and earthy tones are the traditional choice — cream, sand, terracotta, sage green, dusty blue, and warm white all look stunning. But there’s absolutely no rule that says your moon bikini can’t be bold. A deep burgundy or a rich cobalt blue in a high-quality mercerized cotton creates a striking, fashion-forward version of this classic pattern.

Making It Your Own

One of the most beautiful things about working from a crochet pattern is the invitation to personalize. Once you understand the structure of the moon bikini — the circular cup motifs, the band, the gusset, the ties — you have the foundation to make endless variations.

Add fringe to the hemline of the bottoms for a ’70s-inspired look. Work additional rounds onto the cup motifs to create a larger, more dramatic moon. Try a variegated yarn for a sun-drenched, tie-dye effect without any actual dyeing. Use a contrasting color for the band and ties to create visual interest. Add tiny shell or pearl beads to the picot trim by threading them onto your yarn before you begin.

The pattern is also a wonderful template for a matching crochet cover-up. Work