Crochet Bikini Set Tutorial for Beginners: How to Make Your Own Swimwear from Scratch
There is something incredibly satisfying about wearing something you made yourself, and a crochet bikini set might just be the most rewarding beginner project you will ever take on. It sounds intimidating at first — swimwear, structure, ties, fit — but the truth is that a basic bikini set is one of the most straightforward crochet projects once you understand the foundational stitches and construction. This tutorial will walk you through everything from choosing your yarn to finishing your last knot, so you can head into summer wearing something uniquely yours.
Whether you are brand new to crochet or you have made a few dishcloths and scarves and are ready for something more exciting, this guide is written with you in mind. We will cover materials, sizing, the top, the bottom, and all the little tips that make the difference between a swimsuit that falls apart and one that lasts the whole season.
Why Crochet Your Own Bikini?
Before we get into the how, let’s talk about the why. Handmade crochet swimwear has exploded in popularity over the past few years, and for good reason. When you crochet your own bikini, you get complete control over fit. You decide the cup size, the rise of the bottoms, the length of the ties, and the overall coverage. No more settling for whatever the store happens to carry in your size.
Beyond fit, there is the element of style. A crochet bikini has a bohemian, handcrafted look that you simply cannot replicate with mass-produced swimwear. The texture is beautiful, the drape is unique, and when someone asks where you got your suit, you get to say you made it yourself.
Finally, crochet bikinis are genuinely beginner-friendly when you start with the right pattern. The pieces are small, so you are not committing months of work. A single top can be completed in a few hours, and the bottoms are not much more involved. This is a project that delivers fast, wearable results.
What You Will Need
Getting your materials right is the most important step before you cast on a single stitch. Crochet bikinis require a slightly different approach to yarn and hook selection than your average blanket or hat project.
Yarn: For a bikini that actually holds up in the water, you need a cotton yarn or a cotton blend. Pure cotton is the most popular choice because it does not stretch out excessively when wet, it dries relatively quickly, and it feels soft against the skin. Look for a size 2 (fine) or size 3 (light) weight cotton yarn. Some popular choices among crochet makers include Paintbox Simply Cotton DK, Lion Brand 24/7 Cotton, and Drops Safran. Avoid acrylic yarns entirely — they stretch unpredictably when wet and do not recover well, which is not what you want in a swimsuit.
You will need approximately 200 to 300 yards of yarn for the top and another 150 to 200 yards for the bottoms, depending on your size. It is always wise to buy an extra skein so you do not run out mid-project.
Hook: A size 3.5mm (US E/4) or 4mm (US G/6) crochet hook works well for most fine to light weight cotton yarns used in bikinis. The pattern you choose should specify the hook size, and you should always swatch first to confirm your gauge matches. More on gauge in just a moment.
Additional supplies: You will also need a tapestry needle for weaving in ends, scissors, stitch markers, and a measuring tape. Some makers also use small bra cups or swimsuit padding for the top, which can be purchased at fabric stores and sewn or pinned into place after the top is complete.
Understanding Gauge and Why It Matters
Gauge is the number of stitches and rows that equal a specific measurement — usually four inches by four inches. For a bikini, gauge matters more than almost any other project because the difference of even half a stitch per inch can mean the difference between a top that fits perfectly and one that is several inches too large or too small.
Before you begin your bikini, crochet a gauge swatch. Using your chosen yarn and hook, make a square of at least 15 stitches wide and 15 rows tall, then lay it flat, measure the center four inches, and count the stitches and rows within that space. Compare this to the gauge listed in your pattern and adjust your hook size up or down accordingly. If you have more stitches than the pattern calls for, go up a hook size. If you have fewer, go down a hook size.
It feels like an extra step when you just want to get started, but skipping the gauge swatch is the number one reason crochet beginners end up with garments that do not fit. Take the twenty minutes to swatch. You will thank yourself later.
Choosing a Size
Most crochet bikini patterns are written for multiple sizes based on bust measurement, hip measurement, or both. Measure yourself carefully before beginning:
For the top, measure around the fullest part of your bust. Also measure your underbust (just beneath the chest) to determine your band size if the pattern calls for it.
For the bottoms, measure around the fullest part of your hips and also your waist. Take note of whether you prefer a high-rise, mid-rise, or low-rise fit, as the pattern may offer options.
Always size up when you are between sizes in a crochet swimwear pattern. Crochet has more give than knitting, and it is far easier to take in a slightly large garment than to stretch a small one to fit.
The Crochet Bikini Top
The classic beginner crochet bikini top is a triangle style with ties. It requires only basic stitches — chain, single crochet, and half double crochet — and can be constructed in just a few hours.
Stitches used: chain (ch), slip stitch (sl st), single crochet (sc), half double crochet (hdc)
Construction overview: Each triangle cup is worked separately, starting from the bottom point and increasing on each row to build width. Once both cups are complete, they are joined at the center with a seam or a connecting stitch, and long chains are added for the neck tie and the band ties.
Making the first cup:
Begin with a slip knot and chain 2.
Row 1: Work 3 sc into the second chain from the hook. Turn. (3 stitches)
Row 2: Chain 1, work 2 sc in the first stitch, sc across to the last stitch, work 2 sc in the last stitch. Turn. (5 stitches)
Continue repeating Row 2, increasing by 2 stitches each row (one increase at each end), until your cup is the desired width. For a small cup, this is usually around 12 to 14 rows. For a larger cup, you may work 16 to 20 rows. The finished cup should measure roughly 5 to 7 inches across the top edge and 4 to 6 inches tall when laid flat, depending on your size.
At the end of your last row, do not fasten off. Instead, work a row of single crochet evenly around the entire outer edge of the triangle to give it a clean, polished look. Fasten off and leave a long tail for seaming.
Make a second identical cup.
Joining the cups:
Place the two cups side by side with right sides facing. Using your tapestry needle and the long yarn tail, whip stitch or mattress stitch the two cups together along the inner straight edges (the flat vertical sides of each triangle). This creates the center front of your top. The join should be tight enough to hold but not so tight that it puckers the fabric.
Adding the ties:
Reattach your yarn at the top corner of one cup. Chain 60 to 80 stitches for the neck tie (adjust based on your preference — longer chains give more tying options). Fasten off. Repeat on the other top corner.
For the band ties, reattach yarn at the bottom corner on each side of the joined cups. Chain 80 to 100 stitches on each side. These ties wrap around your back and tie at the center. You can also add a second set of ties at the center bottom edge if you prefer a halter-style back, though for most beginners the standard band tie is simpler.
If you want a finished look on your ties, work a slip stitch back along the chain after completing it. This thickens the tie slightly and makes it look more polished.
The Crochet Bikini Bottom
The bikini bottom is essentially a small pair of shorts worked flat and then seamed up the sides, or worked in the round with openings for the leg holes. For beginners, the flat construction method is the most intuitive.
Stitches used: chain (ch), single crochet (sc), half double crochet (hdc), double crochet (dc)
Construction overview: The bottoms are worked in two flat panels — a front panel and a back panel. The back panel is typically a few rows taller to provide more coverage. Both panels are worked from the waistband down to the gusset, then the panels are joined at the sides and the gusset is seamed to create the crotch. Side ties or a waistband with tie ends finish the piece.
Making the front panel:
Chain the number of stitches that equals your hip measurement divided by your row gauge (so if your gauge is 4 stitches per inch and your hips are 36 inches, you want 36 stitches for a full round, which means 18 stitches for the front panel). Adjust based on your pattern and desired coverage — most beginner patterns will give you a stitch count directly based on your size.
Row 1: Sc across. Turn.
Rows 2 through 8 (or as many rows as needed for your desired rise): Chain 1, hdc across. Turn.
At the center bottom of the panel, you will begin decreasing to shape the gusset. Work decreases at each end of every row for 3 to 5 rows until the panel narrows to a width of about 2.5 to 3 inches. This forms the crotch piece.
Fasten off.
Making the back panel:
The back panel is worked the same way as the front, but you will work 2 to 4 additional rows before beginning the gusset decreases. This extra height gives the back more coverage, which most wearers prefer.
Seaming and finishing:
With right sides facing each other, align the front and back panels and use your tapestry needle to seam the side edges together, leaving the waistband edges open. Then seam the gusset — the narrow strip at the bottom — together front to back, enclosing the crotch area.
Turn the bottoms right side out. If desired, work a row of single crochet around the leg openings to neaten the edges and prevent curling.
Adding the waistband ties:
At the top of each side seam, attach yarn and chain 50 to 60 stitches for the side ties. Work a slip stitch back along the chain to finish. These ties allow you to adjust the fit at the hips and give the bottoms their signature string bikini look.
You can also work a continuous waistband by attaching yarn at one side seam, crocheting across the entire front waistband edge, across the opposite side tie, and then continuing around to the back and back again. This creates a more structured waistband that you then thread with a cord or ribbon to tie.
Finishing Touches
Once both pieces are complete, take a few minutes to weave in all your yarn ends using your tapestry needle. Thread the tail through the needle, then weave it back and forth through the yarn on the wrong side of the work, changing direction a few times so it does not pull out. Trim any excess close to the fabric.
Wet blocking is highly recommended for crochet swimwear. Soak your finished pieces in cool water for about 20 minutes, gently squeeze out the excess water (do not wring), then lay flat on a clean towel and shape each piece to your desired measurements. Let dry completely before wearing. Blocking relaxes the stitches, evens out any tension inconsistencies, and gives your finished pieces a much more professional appearance.
If you want to add cup padding or bra inserts to your top, now is the time. Most fabric stores sell adhesive swimsuit padding that you can simply press into the inside of each cup, or you can hand-sew small foam cups in place using a needle and thread in a matching color.
Tips for Success
A few extra notes that will make your crochet bikini experience smoother from start to finish.
Tension consistency matters more in a small garment than a large one. If you notice your tension changing as you work (common when you are tired or distracted), take a break and come back fresh.
Always wash your cotton yarn before beginning if you plan to machine wash your finished piece. Cotton yarn can shrink slightly on its first wash, and pre-washing ensures your gauge stays accurate over time.
If your top feels slightly too large after finishing, try blocking it to the smaller measurement. Cotton responds well to wet blocking and will hold a new shape once it dries.
Try on your work in progress as often as possible. Because a bikini is small, you can hold pieces up to your body or even try them on long before they are finished to check for fit issues before you have invested too many hours.
Do not be discouraged if your first bikini is not perfect. Crochet is a skill that improves with every project, and a slightly imperfect handmade swimsuit is still infinitely more charming than anything you could buy in a store. Wear it proudly.
Caring for Your Crochet Bikini
After wearing your crochet bikini, rinse it thoroughly in cool fresh water to remove chlorine, salt, and sunscreen, all of which degrade cotton fibers over time. Gently squeeze out excess water, reshape if needed, and lay flat to dry. Avoid wringing, twisting, or machine drying. Hand washing with a mild soap is recommended for cleaning.
With proper care, a well-made cotton crochet bikini can last several summers, getting softer and more comfortable with each wear.
You Are Ready to Start
A crochet bikini set is one of those projects that feels ambitious right up until you finish it, and then you wonder why you waited so long. The stitches are simple, the pieces are small, and the result is something genuinely wearable, beautiful, and completely your own.
Gather your cotton yarn, find a comfortable spot, and start with that first chain. Before this week is out, you could be wearing something you made with your own hands. That is one of the best feelings crochet — or really any craft — has to offer.
