The Oahu Swim Suit Free Sewing Pattern

Make waves with the Oahu Swim Suit free sewing pattern—a sleek and supportive one-piece swim suit that is designed to celebrate confidence, style, and sun-drenched moments. Crafted with a figure-hugging silhouette and subtle details, this modern take on the classic swim suit offers both fashion and function, making it a must-have for beach days, pool lounging, and everything in between!

Featuring a timeless scoop neckline in the front and the back, the Oahu Swim Suit flatters the form with elegant simplicity. Its design provides just the right amount of coverage and elongates the silhouette, while the waist belt cinches the look with a polished metal ring—adding a hint of shine and shape. This bathing suit isn’t just chic and stylish—it’s thoughtfully made for wearability in and out of the water.

Made from a Yaya Han polyester tricot with 4-way stretch, this swim suit moves effortlessly with the body while maintaining its shape. Beneath the surface, a high compression PowerNet mesh provides all-around support, helping you feel secure and sculpted without sacrificing comfort. These high-performance fabrics work in tandem to create a swim suit that’s ready for every splash, dive, and sunbeam!

We love how easy it is to customize this pattern—try it in a matte solid for a chic minimalist statement, or go bold with printed tricot for a fashion-forward edge. Whether you’re sewing for vacation or elevating your swimwear basics, the Oahu Swim Suit blends classic design with modern materials for a truly timeless piece.

Ready to sew your own showstopping swim suit? Our step-by-step tutorial walks you through every stage, from cutting the perfect curve to sewing stretch seams with precision. Be sure to browse our curated collection of swimwear fabrics and notions to complete the look—because your next handmade favorite starts with the right materials. Dive in and make it yours!

Essential Materials & Sizing Guide for The Oahu Swim Suit

Here is the breakdown of what knowledge and materials you need for creating your very own swim suit! We’ve got you covered with the recommended materials we used—if you want to follow along exactly—as well as a curated list of alternative fabric recommendations if you want to customize your own version. The Oahu Swim Suit free sewing pattern download includes technical drawings for seam and silhouette visibility, plus a size chart to help you find your perfect fit!

Purchase Products Used Below:

Quantities indicated are for sewing a size small. Toggle the ‘SHOP THIS LOOK’ box to find quantities for other sizes.

• 1.5 yards of Yaya Han Matte Polyester Tricot with 4-Way Stretch – Red
• 1.5 yards of White High Compression PowerNet Mesh
• 1 yard of Dritz Cotton Swimwear Elastic – 0.375″
• 1 each of Schmetz Stretch Twin Machine Needle – 2.5/75 – 1 ct
• 1 each of Schmetz Chrome Stretch Machine Needles – 75/11 – 5 ct
• 1 spool of Gutermann Sew All Thread 250m – 420 Chili Red
• MDF437 – Oahu Swim Suit Sewing Pattern (Free download below!)

Alternative Fabric Recommendations:

The Oahu Swim Suit is best suited for lightweight and medium weight fashion fabrics. If you want to explore other fabric types for sewing the Oahu Swim Suit check out the links below.

• Water Repellent Fabrics
• UV Protective Fabrics
• Tricot
• Spandex
• Ponte Knit

Download Your Free Sewing Pattern

Submit your name and email in the form below to receive the Oahu Swim Suit free sewing pattern directly in your inbox. Mood Sewciety Patterns will send your free download via email with the subject line: ‘Your Free Download from Mood Sewciety’ (in PDF format for A4 and letter-size printing).

Find Your Perfect Fit

The size guide below is based on the suggested design & wearing ease for this style. You can choose the size according to your desired finished garment measurements, blending between sizes as needed. Measure the printed patterns to make sure the dimensions are according to the desired fitting and adjust—if needed—before cutting the fabric. For best results, sew a test garment in a similar fabric to adjust your pattern.

Note: * Designed for four-way stretch fabrics (with at least 50% stretch both ways). Size guide is based on the suggested design and wearing ease for this style. There is negative ease due to the stretch of the fabric. You can also choose the size according to your desired finished garment measurements, blending between sizes as needed. For best results, sew a test garment in a similar fabric to adjust your pattern.

How To Sew The Oahu Swim Suit

The instructions provided are designed to guide you through sewing the main fabric and the lining fabric for the Oahu Swim Suit simultaneously.

Sew with 3/8″ seam allowance for all seams unless otherwise specified.

Change your machine settings to a stretch stitch & sew with either a jersey needle, stretch needle, or a ballpoint needle.

Step 1 

SHOULDER SEAMS

Sew the front and back together at the shoulder seams.

(Repeat this step for the lining)

Step 2

SIDE SEAMS

Sew the front and back together at the side seams.

(Repeat this step for the lining)

Step 3

INSEAM

Sew the front and back together at the inseam.

(Repeat this step for the lining)

Step 4

JOIN NECKLINES

Join the main fabric and the lining together at the neckline.

• Place the main fabric inside the lining fabric with right sides together.
• Sew both fabrics together all around the front and back of the neckline.

Step 5

UNDER STITCH

Under stitch around the neckline by sewing the seam allowance to the lining fabric.

(Top stitch at the end if needed)

Step 6

ELASTIC

Sew the elastic around both arm holes and both leg holes.

(Finish the edges with an overlock stitch)

Step 7

HEM

Use a twin needle to sew 1/4″ hem on each arm and each leg.

Step 8

BELT

Join the front and back of the belt pieces together.

• Leave the ends open.
• Sew the top and bottom of the belt pieces together.
• Use the openings to turn the belt right side out.
• Press the edges flat.

Step 9

BELT RING

Finish the ends of the belt with the metal ring.

• Insert the ends through each side of the ring.
• Tuck in the edges similar to a double-folded hem.
• Use a zipper foot to sew as close to the ring as possible.

Step 10

ATTACH BELT

Sew the belt to the swim suit.

• Place the belt around the waist of the swim suit.
• Align the metal ring with center front.
• Sew the belt down the side seams to keep it in place

The Completed Oahu Swim Suit Free Sewing Pattern by Mood Fabrics

We can’t wait to see your version of the Oahu Swim Suit! Whether you choose tricot, ponte knit, or spandex, this pattern is the perfect canvas for your creativity and sewing skills.

Share this post with a friend (or two!), download the Oahu Swim Suit free sewing pattern, and show us which fabrics and colors you choose, using the hashtags #MoodOahuPattern & #MadeWithMood.