There is nothing quite as satisfying as wearing something you’ve crafted with your own two hands, especially when it fits perfectly. This adjustable triangle bikini top is designed to be versatile—you can customize the size, the coverage, and the length of the ties, ensuring it fits you like a glove.

Project Overview
- Skill Level: Beginner
- Time Commitment: 2–3 hours
- Style Notes: Using a half-double crochet stitch gives this top a smooth, dense texture that provides great coverage while maintaining a soft, comfortable drape.
What You’ll Need
- Yarn: Cotton or Cotton-blend yarn (e.g., Lion Brand 24/7 Cotton). Avoid acrylic for swimwear as it doesn’t handle water well.
- Hook: 3.5mm or 4.0mm (depending on your yarn weight).
- Extras: Scissors, measuring tape, and a yarn needle.
The Pattern
The Cups (Make 2)
- Foundation: Chain 10.
- Row 1: Half Double Crochet (HDC) in the 3rd ch from the hook and each chain across. (8 sts)
- The Curve: In the final stitch, work 3 HDC, ch 1, 3 HDC. This creates the “pivot” point that turns the triangle.
- Return Path: HDC in each remaining stitch back down the other side of your foundation chain.
- Growth: Ch 2 and turn. HDC in each stitch across until you reach the center chain space.
- Center Space: In the chain-1 space, work 2 HDC, ch 1, 2 HDC.
- Complete Row: HDC in each stitch to the end.
- Repeat: Continue rows 5–7 until the cup reaches your desired size/coverage.
The Under-Bust Band
Once both cups are completed, connect them.
- Hold both cups together, right-sides facing up.
- Attach your yarn to the bottom outer corner of the first cup and Single Crochet (SC) along the entire bottom edge of both cups, connecting them together in the middle.
- This creates a clean, professional finish along the base of your bikini top.
The Ties (The Adjustable Part)
- Neck Ties: Cut 6 long strands of yarn (approx. 20 inches each). Insert them into the top corner of each cup, tie a secure knot at the base to hold them, and braid them all the way down. Tie a final knot at the end.
- Back Ties: Repeat this process for the bottom outer corners of your bikini cups.
Expert Tips for a Perfect Fit
- Custom Sizing: The beauty of this pattern is its customizability! Hold your work up to your body as you crochet the rows. If you want more coverage, simply add more rows. If you want a “mini” bikini look, stop when the triangles feel small enough for your preference.
- The “HDC” Advantage: Many patterns use Double Crochet, but the Half Double Crochet (HDC) stitch is the secret to a high-quality top. It is tighter and less prone to “gaping,” meaning it will stay opaque even when wet.
- Fiber Choice is Key: Always choose 100% Cotton for swimwear. Synthetic fibers like acrylic tend to stretch out significantly when wet, which can lead to… well, let’s just say a “wardrobe malfunction” at the beach! Cotton holds its shape and dries relatively well.
- Tension Consistency: If the corners of your triangles are curling, you are likely pulling your yarn too tightly on the increase rows. Keep a loose, relaxed hand on those corners to ensure the fabric stays flat.
A Note to My Fellow Makers
This top is more than just a piece of clothing; it’s a foundation for your summer wardrobe. Once you master the basic triangle, you can experiment with adding fringe, beads to the ends of the ties, or even using variegated yarn for a colorful, bohemian look.
Are you ready to gear up for Spring Break?
Grab your cotton yarn and your favorite hook. There is a special kind of pride that comes with wearing your own work to the beach. Enjoy the meditative rhythm of those HDC stitches, and don’t forget to take a picture of your finished top!