Crochet Teal & Coral Granny Square Two-Piece Set & Phone Case Pattern
There is something deeply satisfying about a project that starts with a single granny square and grows into something wearable, functional, and completely your own. The teal and coral color combination has been having a major moment in the fiber arts world, and for good reason — these two colors sit on opposite sides of the color wheel, which means they create a vibrant, eye-catching contrast that somehow still feels relaxed and beachy. When you build an entire two-piece set and matching phone case around this palette using the classic granny square motif, you end up with something cohesive enough to look intentional and handmade enough to be truly special.
This pattern guide will walk you through everything you need to know to make a crochet teal and coral granny square two-piece set along with a coordinating phone case. Whether you are a seasoned crocheter looking for your next statement project or an intermediate maker ready to level up, this is one of those patterns that rewards patience and grows more beautiful with every motif you finish.
Why Teal and Coral Work So Well Together
Before we get into the hook sizes and stitch counts, it is worth spending a moment on color theory because understanding why teal and coral are such a dynamic duo will help you make thoughtful choices as you work through this project.
Teal sits in the blue-green family, a cool, grounding tone that evokes ocean water, sea glass, and tropical leaves. Coral, on the other hand, is warm and lively — a blend of orange, pink, and peachy tones that feels sunlit and energetic. When you place these two colors next to each other, they create what designers call a complementary or near-complementary contrast. Each color makes the other appear more vivid than it would on its own.
In a granny square, this means your rounds pop. The teal rounds feel crisp and defined, the coral rounds feel warm and welcoming, and the finished squares have a layered depth that makes people stop and ask, “Did you really make that?” The answer is yes. You absolutely did.
You can play with dominance in this project — whether you want teal to lead with coral as an accent, or a more even split, or whether you want to bring in off-white or cream as a neutral third color to let both shades breathe. All three approaches work beautifully and produce quite different results.
Materials You Will Need
Getting your materials right before you start will make the whole project run smoothly. Here is what you need for the full two-piece set and phone case.
For yarn, you will want a medium weight (size 4) cotton or cotton-blend yarn in teal, coral, and optionally a neutral like cream or white. Cotton is strongly recommended for a wearable set because it drapes beautifully, holds its shape after washing, and feels comfortable against the skin. A full two-piece set (top and bottom) will require approximately 800 to 1,000 yards of teal, 600 to 800 yards of coral, and 200 to 300 yards of neutral if you are using one. The phone case adds minimal yardage — roughly 30 to 50 yards total across all three colors.
For hooks, a 4mm (G/6) or 4.5mm (7) hook works well for size 4 cotton. The exact hook size depends on your tension. You want a fabric that has a little drape but is not so loose that it becomes see-through or flimsy for the top and bottoms. For the phone case, you may want to go down a half size (3.5mm) to create a slightly firmer fabric that will protect your phone.
Other supplies you will need include a yarn needle for weaving in ends, scissors, stitch markers to track rounds, a measuring tape, and a seaming method (slip stitch join, flat slip stitch join, or whip stitch all work for granny square assembly). Blocking mats and pins are extremely helpful for getting your squares flat and uniform before assembly.
Understanding the Classic Granny Square
The granny square is one of crochet’s most recognizable and beloved motifs. It is a modular, square-shaped piece built in rounds from the center outward, with chain spaces at each corner that create the characteristic open, lacy structure.
The standard granny square is worked in clusters of three double crochets (or sometimes treble crochets, depending on the pattern), separated by chain-one spaces within rounds and chain-two or chain-three spaces at the corners. Each new round is typically joined with a slip stitch and begun with a standing stitch or a chain.
For the teal and coral two-piece set, a classic four-round granny square works best. Here is a general breakdown of the rounds using this color scheme:
Round 1 (coral): Make a magic ring. Chain 3 (counts as first double crochet), work 2 double crochets into the ring, chain 2. Work 3 double crochets, chain 2 three more times. Join with a slip stitch to the top of the beginning chain. Fasten off. This creates the center cluster with four corner spaces.
Round 2 (teal): Join yarn in any corner space. Chain 3, work 2 more double crochets into the same space, chain 2, work 3 more double crochets into the same corner space. Chain 1. Into each of the next three corners, work 3 double crochets, chain 2, 3 double crochets, chain 1. Join with a slip stitch. Fasten off.
Round 3 (coral): Join yarn in any corner space. Chain 3, 2 double crochets in corner, chain 2, 3 double crochets in corner. Chain 1, 3 double crochets in side chain-1 space, chain 1. Work each corner the same way. Join and fasten off.
Round 4 (teal or neutral): Work the same pattern, adding one additional 3-double-crochet cluster per side as the square grows. This final round finishes the square with a clean border and gives it its full, defined shape.
The resulting square should measure approximately 4 to 5 inches per side when blocked, depending on your tension and hook size. All your squares must measure the same before you assemble the garments, so blocking is not optional for this project — it is essential.
The Crochet Granny Square Top Pattern
The two-piece set begins with the top. The style described here is a bralette or crop top silhouette made entirely of joined granny squares with minimal shaping. It is flattering, breathable, and surprisingly quick once you develop a rhythm with the squares.
Planning your layout: Before you start crocheting, sketch out your top on paper or use a planning app. A simple granny square crop top for an average adult size small or medium might use a grid of three squares across and two squares high for the front panel, with a matching back panel, and a single row of half squares or full squares along the straps. You can adjust the grid to fit your measurements. Measure your bust and divide by your square size to figure out how many squares you need across. Measure from your underarm to where you want the hem to hit and do the same for height.
Making the squares: Crochet all your squares to the same size before assembling anything. This is the part of the project that feels meditative once you get into it. Put on a podcast or a good playlist and make your pile of teal and coral squares. You will likely need somewhere between 12 and 24 squares for the top panels depending on your sizing and square size.
Assembly: Lay your squares out on a flat surface in the arrangement you planned. Seam them together using a flat slip stitch join for an almost invisible seam, or a visible join (worked with a contrasting color on the right side of the fabric) for a decorative effect. Many makers use a coordinating coral or teal yarn for the seam and make the joining part of the design.
Finishing edges: Once the panels are assembled, crochet a border around all the edges. A simple single crochet border works well and keeps everything clean. For the neckline and arm openings, you can add a round of reverse single crochet for a neat, rolled edge. Straps can be made as crochet chains or narrow bands of single crochet, long enough to tie at the shoulders or back or to attach with an adjustable ring.
Lining: For coverage and comfort, many makers add a fabric lining to the top, particularly for the bralette style. A soft cotton jersey in a coordinating color works beautifully. This is optional but highly recommended if you plan to wear the top in public or at the beach.
The Crochet Granny Square Bottom Pattern
The bottoms — whether you make them as a full skirt, a mini skirt, or bikini bottoms — follow the same construction logic as the top.
For a mini skirt, you will create a rectangular panel of joined granny squares wide enough to wrap around your hips and tall enough to hit your desired hemline. Use a waistband of single crochet or ribbing stitch worked directly onto the top edge of the joined squares, adding elastic through the waistband channel for a comfortable, secure fit. The hem can be finished with the same reverse single crochet border as the top, or with a few rows of shells or picot stitch for something more decorative.
For bikini bottoms, the construction is more involved. You will need two smaller panels — one for the front and one for the back — seamed at the sides and crotch, with leg openings and waist edges finished in single crochet and threaded with elastic or tie strings. Many patterns for granny square bikini bottoms use two to four squares per panel, depending on the size and square dimensions.
A coordinating wrap skirt is another popular option for this style of set: a long rectangular panel of granny squares with ties at each end. This is the simplest version to make and requires no fitting — just measure your desired wrap length and height and assemble squares accordingly.
The Crochet Granny Square Phone Case Pattern
The matching phone case is the most satisfying finishing touch for this project. It is small, quick to complete, and gives you something functional to show off alongside the wearable pieces.
Measuring your phone: Before you start, measure the height, width, and depth of your phone. The case needs to fit snugly without being so tight that it is difficult to use.
Construction: The phone case is made as a flat rectangle of joined mini granny squares (2 to 3 rounds each rather than 4), sized to wrap around your phone. You will make two panels — front and back — each measuring the width of your phone plus a small buffer. Join them along three sides (bottom and two sides), leaving the top open for access.
Alternatively, you can work the case in continuous rounds as a tube, starting from a foundation chain, and then add granny square motifs as surface embellishment or patchwork panels along the sides.
For the closure, a button and chain loop works perfectly and adds a cute vintage touch. A magnetic snap is another clean option if you are comfortable adding a small hardware element to your crochet work.
The strap can be a long crochet chain or a braided cord twisted from all three colors — teal, coral, and cream — which ties the phone case beautifully into the rest of the set.
Tips for Getting Your Squares Consistent
The biggest challenge in any granny square project is consistency. Even experienced crocheters can find that their tension shifts between squares, resulting in pieces that do not line up properly during assembly. Here are the most helpful strategies for keeping things consistent.
Use the same hook throughout. Even switching between two hooks of the same size but different brands can affect tension slightly. Pick one hook and stick with it for all the squares in a given project.
Block every single square before assembly. Wet blocking cotton yarn squares is simple: wet the squares, gently squeeze out excess water (do not wring), pin them to your blocking mat in a perfect square shape using a ruler to verify, and let them dry completely. This step makes an enormous difference.
Work with the same yarn throughout. If you run out of one skein and start a new one mid-project, check that the dye lot is the same or very close. Teal in particular can vary significantly between dye lots.
Count your stitches. It sounds obvious but it is easy to add or drop a stitch in the first round when you are distracted. A consistent stitch count from the start means consistent square size throughout.
Customization Ideas
One of the best things about a granny square set is how naturally it lends itself to customization. Here are some ideas to make this pattern uniquely yours.
You can vary the color distribution across the squares. Instead of every square being made with the same round-by-round color order, try alternating which color appears in which round. Some squares lead with teal, some with coral, some with a neutral center. When joined, these create a more organic, patchwork effect.
You can mix square sizes. Combining standard squares with half squares (triangles) and quarter squares gives you more flexibility in shaping garments and creates visual interest in the finished fabric.
You can add embellishments. Small crochet flowers in coral and teal tucked into the corner spaces of a few squares give the set a maximalist, boho feel. These look especially beautiful on the phone case.
For the phone case specifically, you can add a small pocket on the front panel worked in single crochet for a card or some cash — a detail that takes almost no extra time and makes the case much more useful.
Caring for Your Finished Set
Cotton and cotton-blend crochet garments are relatively easy to care for compared to wool. Machine washing on a gentle cycle in cold water is usually safe, though hand washing is always the kindest option for extending the life of the garment. Lay flat to dry — never hang a crochet garment to dry, as gravity will distort the shape significantly over time.
Store your set folded rather than hanging for the same reason. With proper care, a cotton granny square set can last for years and becomes more softened and comfortable with every wash.
A Final Word on This Project
Making a crochet teal and coral granny square two-piece set and phone case is a project that will stay with you long after the last end is woven in. Every square is a small accomplishment, every seam a step toward something beautiful and entirely handmade. The teal and coral palette keeps things feeling fresh and modern while the granny square construction pays homage to a long, rich tradition of textile making.
Whether you wear the set at the beach, to a festival, or around the house on a warm afternoon, it will draw compliments and spark conversations. And when someone asks where you got it, you will get to say the most satisfying thing a maker can say: I made it myself.
Happy crocheting.
