Crochet Moon Bikini Pattern | Handmade Crochet Bikini | Boho Beachwear
There is something undeniably magical about wearing a swimsuit you made with your own two hands. The texture, the intention, the perfect fit — none of it comes from a department store rack. If you have been searching for a crochet moon bikini pattern that feels as romantic as it looks, you have landed in exactly the right place. This guide walks you through everything you need to know to create a handmade crochet bikini with boho beachwear energy, whether you are a seasoned crocheter or someone who has just mastered the granny square.
The moon bikini has become one of the most beloved styles in the handmade swimwear community, and it is not hard to see why. With its crescent-shaped cups, open lacework body, and free-spirited aesthetic, it captures that effortless coastal bohemian vibe perfectly. Pair it with linen wide-leg pants, a shell necklace, and sun-kissed skin, and you have an entire mood that no fast fashion brand can replicate.
Let us dive deep into this pattern — materials, sizing, stitches, construction, and finishing — so you can bring your dream boho bikini to life.
Why Make a Handmade Crochet Bikini?
Before we get into the how, let us talk about the why. Handmade crochet swimwear has exploded in popularity over the past several years, and it is not just a trend. It is a movement toward intentional, sustainable fashion. When you crochet your own bikini, you choose every element: the fiber, the color, the fit, the drape. You are not confined to whatever is hanging on the clearance rack in mid-July.
A crochet moon bikini is also a deeply personal project. The hours you spend making it become part of the garment itself. Every stitch carries intention. And practically speaking, a handmade crochet bikini can be adjusted for your unique measurements, which is something off-the-rack swimwear almost never gets right.
There is also a community dimension to this. Sharing your finished project on social media, swapping tips with other makers, and being part of the broader world of boho beachwear crochet creates connections that go far beyond the finished object.
Materials You Will Need
Getting your materials right is half the battle when it comes to crochet swimwear. The moon bikini requires just a few core supplies, but the quality of those supplies will make a real difference in the finished look and durability.
Yarn: The most important choice you will make is your yarn. For a crochet bikini that holds up to sun, sand, saltwater, and chlorine, you want a cotton or cotton-blend yarn. Look for something labeled as a size 3 light weight or size 10 crochet thread, depending on how open and lacy you want your fabric. Nylon-blend cotton yarns add a touch of stretch and resilience that makes them ideal for swimwear. Brands like Paintbox Simply DK Cotton, Lion Brand 24/7 Cotton, and Hobbii Rainbow Cotton 8/4 are all popular choices among crochet bikini makers. Avoid wool entirely — it felts when wet and loses its shape. Stay away from purely synthetic yarns unless they are specifically designed for swimwear, as they can feel clammy when wet.
Hook: A size 2.5mm to 3.5mm crochet hook is typical for this type of project, depending on your yarn weight and your personal tension. If you tend to crochet tightly, go up a hook size. If you crochet loosely, go down. Always, always swatch before you begin.
Elastic: For the waistband of the bikini bottoms, you will need soft swimwear elastic, typically 1 inch or 3/4 inch wide. Swimwear elastic is designed to resist chlorine and saltwater degradation in a way that standard craft elastic simply is not. It is worth seeking out the real thing.
Stitch markers: A handful of locking stitch markers will save your sanity when keeping track of rounds and increases.
Tapestry needle: You will need this for weaving in ends and, in some versions of the pattern, for adding embellishments.
Scissors and measuring tape: The usual suspects.
Optional but lovely: wooden or shell buttons for closures, macramé cord for ties, and small beads or charms for added boho detail.
Gauge and Sizing
Gauge is where many crochet bikini projects go wrong, so please do not skip this step. Work a 4×4 inch swatch in your chosen stitch pattern, wash and dry it as you would the finished garment, and measure again. Swimwear stretches when wet and often relaxes in size, so getting an accurate wet gauge is crucial.
For this moon bikini pattern, a general working gauge of 20 stitches and 22 rows per 4 inches in single crochet using a 3mm hook and light worsted cotton is a solid baseline.
Sizing guide:
The pattern as written below covers sizes XS through XL. You will adjust your starting chain count and row repeats based on the sizing notes provided with each section. Always measure yourself before selecting a size, and refer to the finished measurements rather than standard clothing sizes.
For the top, you will be measuring your underbust and full bust. For the bottoms, you will need your hip measurement and your waist measurement, as well as your preferred rise height.
Understanding the Moon Bikini Design
The defining feature of the moon bikini is the cup shape of the top. Unlike a traditional triangle top, which forms a simple triangular panel, the moon top features cups that are worked in the round or in curved rows to create a gentle crescent or half-moon shape. This provides more structure, more coverage if you prefer it, and a distinctly boho-romantic silhouette.
The body of the top connects the cups with a band or a series of straps worked in chains and slip stitches, often with a halter-style neck tie and a back closure tie. The result is something that looks delicate and handcrafted, because it is.
The bottoms in this style typically feature a high-cut leg with a full coverage seat, a crochet waistband with either tie closures on the sides or a solid crochet panel that secures over the elastic. The lace-like texture of the crochet fabric is part of the appeal — just remember to line the gusset area with swimwear fabric for both comfort and modesty.
The Pattern: Crochet Moon Bikini Top
Stitches Used
Before you begin, make sure you are comfortable with the following stitches: chain (ch), slip stitch (sl st), single crochet (sc), half double crochet (hdc), double crochet (dc), and shell stitch (sh: 5 dc in same stitch). You will also use increases (inc: 2 stitches in same stitch) and decreases (dec: joining two stitches into one).
Cup Construction
The moon bikini cup is worked from the center outward in rows that build a rounded shape. Work two cups identically unless you are adjusting for asymmetry.
Foundation: Chain 4, join to form a ring with a slip stitch, or work into a magic ring.
Row 1: Ch 1, work 10 sc into the ring, do not join, turn. (10 sts)
Row 2: Ch 1, inc in each st across, turn. (20 sts)
Row 3: Ch 1, [sc 1, inc] repeat across, turn. (30 sts)
Row 4: Ch 1, [sc 2, inc] repeat across, turn. (40 sts)
Row 5: Ch 1, [sc 3, inc] repeat across, turn. (50 sts)
Continue in this increasing pattern until your cup piece measures the desired diameter for your cup size. As a general guide, a size small cup works to about 4 inches in diameter, a medium to about 4.5 inches, and a large to about 5 inches or more. Because you are only working in rows rather than completing the full circle, you will end up with a half-moon or crescent shape — which is exactly what gives this bikini top its name.
Once the cup is the right size, work one round of single crochet around the entire edge to stabilize and neaten the shape, then fasten off. Repeat for the second cup.
Shell Stitch Border
The shell stitch border is what elevates this cup from a simple crochet circle to a truly boho piece. Working along the straight edge (the bottom of the crescent), work a shell stitch repeat: [sc in first st, skip 2 sts, sh in next st, skip 2 sts] repeat across, ending with a sc. This creates that beautiful fan lace effect along the bottom edge of the cups.
Joining the Cups and Adding Ties
To join the two cups, line them up with the shell stitch borders facing downward and the curved edges facing up. Work a length of chain stitches between them — approximately 10 to 15 chains, depending on how much space you want between the cups — and slip stitch into the edge of the second cup. This chain bridge becomes your center front band.
For the halter ties: with your yarn, chain approximately 70 to 90 stitches (or your preferred tie length) and join to the top outer corner of one cup. Work a row of single crochet back along the chain to give the tie body and prevent curling. Repeat for the other cup. These will tie at the back of your neck.
For the underband ties: chain 60 to 80 stitches from the bottom outer corner of each cup, single crochet back along the chain. These will tie behind your back to close the top.
Weave in all ends securely. Block the cups lightly by dampening them and shaping them over a round object (a small bowl works beautifully) and allow to dry completely before wearing.
The Pattern: Crochet Moon Bikini Bottoms
Waistband
Begin with your waistband. Chain enough stitches to fit around your waist or hips, depending on your preferred rise, with a small amount of negative ease (about 1 to 2 inches smaller than your actual measurement, since the crochet will stretch slightly).
Join to form a ring with a slip stitch. Work in rounds of single crochet for 1 to 2 inches, or to your preferred waistband height. On the final round, work a single crochet through both the crochet fabric and the swimwear elastic simultaneously, encasing the elastic inside the band. This gives the waistband its stretch and recovery.
Alternatively, you can thread the elastic through the band after the fact if you work your waistband in a stitch that creates a natural channel.
Front Panel
Attach yarn to the center front of the waistband and work downward in rows, decreasing at each side every row or every other row to create the curved edge of the bikini front. A good starting width for the front panel is 40 to 50 stitches for a medium, reducing to 20 to 25 stitches at the gusset.
Work the front panel in a simple shell or mesh stitch for a lacy look, or in single crochet for full coverage. Continue until the panel reaches the desired length from waistband to gusset — typically 8 to 10 inches for a standard rise.
Back Panel
The back panel begins at the waistband similarly to the front, but typically starts wider and tapers more gradually, ending at a similar gusset width as the front. Work in single crochet for the back to ensure coverage and comfort.
Gusset
The gusset connects the front and back panels. Work a rectangular panel in single crochet wide enough to span the gusset measurement, and join it to the bottom edges of both the front and back panels using a slip stitch seam or mattress stitch. Line this section with swimwear lining fabric cut to shape and hand-stitched in place.
Leg Edges
Work one round of single crochet around each leg opening to stabilize, then add a shell stitch border for a consistent boho finish that matches the top. Alternatively, work a picot edging (sc, ch 3, sl st in first ch to form picot, sc in next) for a delicate, lacy look.
Finishing Touches and Boho Details
The finishing details are where your crochet moon bikini truly becomes your own. Here are some ideas to make it uniquely yours.
Fringe: Cut lengths of yarn about 6 inches long and fold them in half, pulling the loop through a stitch at the hem of the cups or the waistband and threading the ends through. Trim to an even length. Fringe adds incredible movement and that quintessential festival-beach energy.
Beads and shells: Thread small wooden beads, sea glass, or tiny shells onto your fringe or tie ends. You can also use a tapestry needle to thread beads directly onto the yarn before working certain stitches for an integrated beaded effect.
Macramé accents: Replace the simple chain ties with knotted macramé cord ties in a complementary color. The texture contrast between the soft crochet and the structured cord is beautiful and very boho.
Embroidery: Use a contrasting color of yarn and a tapestry needle to work small floral or star motifs onto the cups after the fact.
Color choices: The moon bikini looks stunning in earthy tones — terracotta, sage, warm sand, dusty rose, deep ocean blue — but it is equally beautiful in crisp white or warm cream for a classic coastal look. Consider tonal color changes or adding a stripe at the shell stitch border in a contrasting color.
Care Instructions for Your Handmade Crochet Bikini
Taking care of your handmade piece will extend its life considerably. After wearing in the ocean or pool, rinse your bikini immediately in cool fresh water to remove salt, chlorine, and sand. Hand wash gently with a mild detergent or specialized wool/delicate wash — never machine wash or machine dry a crochet bikini. Squeeze gently, never wring, and lay flat to dry away from direct sunlight, which can fade even colorfast yarn over time.
Store your bikini flat or loosely folded, not hung, to prevent the stitches from stretching out of shape.
Tips for Success
Cotton yarn can be unforgiving to work with because it has no natural stretch or elasticity, so your tension needs to be consistent. If you find your tension changes when you are tired or distracted, put the project down and pick it up fresh.
Work your swatch. Yes, again: work your swatch. It takes twenty minutes and can save you from making a bikini that is two sizes off.
If you are new to garment construction, consider making the bottoms first. They are a simpler construction and will help you get comfortable with the yarn and hook before you tackle the shaped cups of the top.
Join a crochet-along community or look for a crochet moon bikini making group online. The shared experience of working through a pattern with others is incredibly valuable, and you will pick up tips and modifications you would never have found on your own.
Finally, be patient with yourself. Crochet swimwear is a skill that builds over time. Your first handmade crochet bikini will not be perfect, and that is completely fine. It will be yours, made by your hands, and that matters more than perfection.
Final Thoughts
A crochet moon bikini is more than a pattern. It is a practice in slowness, in attention, and in the quiet joy of making something beautiful from scratch. Whether you are creating this boho beachwear for a summer trip, a photoshoot, a gift, or simply for the pleasure of the making itself, the process is as rewarding as the finished piece.
Take your time, enjoy every round, and wear what you make with pride. The beach will still be there when you finish. And when you walk across that sand in a handmade crochet bikini you made yourself, you will understand exactly why so many makers keep coming back to this craft again and again.
Happy hooking, and happy swimming.
