Best Swimsuit Styles for a Rectangle Body Shape: Create Curves With Confidence
What is the best swimsuit for a rectangle body shape? The best swimsuit for a rectangle body shape is one that creates the illusion of curves and defines your waistline. Think high-waisted bikinis, cutout monokinis, and one-pieces with ruching or strategic paneling that add visual dimension where you want it most. Your bust, waist, and hips are naturally balanced, so the goal is to add shape through clever design details that create the appearance of a more defined waist. The right silhouette can transform your beach look from straight-lined to sculpted in seconds, and with the right styling tricks, you can easily create an hourglass effect that feels natural and effortless.
The Best Swimwear for Rectangle Body Shapes: What to Look For
If you have a rectangle body shape, your bust, waist, and hips are roughly the same width, giving you a naturally athletic and balanced frame. This shape, also known as a straight or banana body type, is common among women who have a naturally sporty build or a more linear silhouette. The goal with swimwear is to create curves and waist definition — and Be Juliet has plenty of styles designed to do exactly that. Let's walk through the top swimsuit styles that flatter a rectangle body, with real products you can shop right now.
1. High-Waisted Bikinis: Instant Waist Definition
A high-waisted bikini bottom is the rectangle body shape's best friend. It cinches the narrowest part of your torso while adding gentle curve to the hips, creating that coveted hourglass effect. The Harriet High Waist Patchwork Bikini ($48) is a standout — its structured high-rise bottom sits at your natural waist and the patchwork print adds visual interest that breaks up a straight silhouette. The top features a supportive fit that works well for a range of bust sizes, making it a versatile choice for rectangle body types who want both style and substance.
For a bolder take, the Euphoric High Waisted Patchwork Bikini ($54) uses color-blocking panels to create the illusion of curves at the hips, while the Lilo Patchwork Bikini ($42) brings a playful vintage feel with a high-waist bottom that flatters from every angle. As Vogue notes, "high-waisted briefs are ideal for curvier girls" — and they work just as well for creating curves on a straight frame (see Vogue's complete swimsuit guide). The key is choosing a bottom that hits at the narrowest part of your waist and sits high enough to lengthen your legs.
2. Cutout Monokinis and One-Pieces: Waist Accents That Work
Nothing defines a waist quite like a well-placed cutout. The Brooke Monokini Swimsuit ($44) features side cutouts that instantly draw the eye inward, creating the appearance of a narrower middle. The silhouette hugs your frame and uses negative space to sculpt your shape — a clever styling trick that works especially well for rectangle body types. Similarly, the Snake Cutout Monokini ($44) uses asymmetrical cutout detailing to add shape and dimension where you want it most.
These styles work especially well for rectangle body types because the negative space at the waist tricks the eye into seeing more curve. Look for one-pieces with belted details, side ties, or wrap elements — all of which add definition to the midsection. A monokini is also a great middle ground if you want the coverage of a one-piece with the waist-defining impact of a two-piece. Pair yours with a sheer cover-up or a high-waisted skirt for a complete beach-to-street look.
3. Structured One-Pieces: Shape and Support
For those who prefer full coverage, a well-structured one-piece can do wonders for a rectangle body shape. The Velvet One Piece Swimsuit ($55) offers a luxurious fitted silhouette with enough structure to hug your curves in all the right places. The rich velvet fabric adds a touch of texture that naturally creates visual depth, making your silhouette appear more dimensional. The Embry One Piece Swimsuit ($38) is a more affordable option with a classic cut that still flatters — pair it with a belt or a sarong tied at the waist for extra definition.
When shopping for a one-piece as a rectangle body type, look for ruched sides, strategic seaming, or a defined waistband. These design details are your secret weapons for creating the appearance of curves without adding bulk. A one-piece with a deep V-neckline can also help elongate your torso and create a more balanced proportion, especially when paired with a high-cut leg that lengthens your lower body.
4. Cover-Ups That Add Dimension
Don't forget the power of a great cover-up. A Maisy Crochet Cover Up ($49) adds volume at the hips and shoulders, creating a more balanced overall proportion. Layer it over a high-waisted bikini for a look that's both beach-ready and figure-flattering. The open crochet texture adds visual interest while the relaxed fit skims your body without hiding your shape entirely. The Kimono Swim Cover Up ($44) is another great option — its flowy, open silhouette contrasts with a fitted bikini underneath to create shape. A belted cover-up is especially effective: tie a knot or add a thin belt at your natural waist to instantly define your middle.
5 Swimsuit Styling Tips for a Rectangle Body Shape
- Go high-waisted. High-rise bikini bottoms are your most effective tool for creating the illusion of hips and a defined waist. Look for bottoms with a rise of at least 10 inches that sit at your natural waist.
- Embrace cutouts. Side cutouts and waist cutouts on one-pieces and monokinis add visual waist definition instantly. They are the single most effective design feature for creating an hourglass effect.
- Use color blocking. Patchwork prints and contrasting panels naturally create curves by breaking up the line of your body. Horizontal patterns at the hips and darker panels at the waist work best.
- Add volume on top and bottom. Ruffled or embellished tops and hip-accenting bottoms balance a straight torso. Crochet textures and layered details add dimension without adding weight.
- Layer with purpose. A crochet cover-up or belted sarong adds dimension that flatters a rectangle silhouette. The contrast between a fitted swimsuit and a flowy layer creates natural shape.
What Our Customers Say
Our community of Be Juliet women loves how our swimwear fits real bodies. From the Harriet's waist-defining high rise to the Brooke's sculpting cutouts, our customers consistently tell us that the right swimsuit changes how they feel at the beach. Read their reviews here and see what styles are working for women with your body type. One customer recently described the Harriet bikini as "the first swimsuit that actually made me feel like I have curves" — and that is exactly the kind of confidence we design for. Plus, every Be Juliet order ships free and comes with easy returns — so you can find your perfect fit risk-free.
Find Your Perfect Swimsuit Today
Ready to shop swimwear that flatters your rectangle body shape? Browse our full swimwear collection to find high-waisted bikinis, cutout one-pieces, and everything in between. Every Be Juliet swimsuit is designed with real women in mind — LA-born, Parisian-spirited, and made to make you feel amazing. Whether you are heading to a beach vacation in Malibu or a poolside lunch in the South of France, we have a style that will make you look and feel your best. Contact our team if you have questions about sizing or fit — we are here to help.
Frequently Asked Questions
What is a rectangle body shape?
A rectangle body shape, also known as a straight or banana shape, is characterized by similar measurements across the bust, waist, and hips with little waist definition. The silhouette is more straight up and down than curvy. Many athletes and women with a naturally lean build have this body type, and it is actually one of the most versatile shapes for fashion.
What swimsuit styles should a rectangle body shape avoid?
Avoid straight-cut, boy-short style bikini bottoms and boxy, unconstructed one-pieces that do nothing to define the waist. Thick waistbands that cut straight across the midsection can also make the torso appear boxier. Instead, choose styles with waist-defining details like ruching, cutouts, or high-rise bottoms.
Can a rectangle body shape wear a bikini?
Absolutely. High-waisted bikinis are especially flattering for rectangle body shapes because they cinch the waist and add visual curve to the hips. Patchwork prints and color-blocked two-pieces are excellent choices. The key is choosing bottoms that create definition at the waist and tops that add volume where you want it.
What color swimsuit is best for a rectangle body shape?
Color-blocked and patchwork swimsuits are ideal because contrasting panels create the illusion of curves. Bright patterns at the hips and darker shades at the waist can enhance your natural shape. For a complete fit guide and sizing tips, check our FAQ page where we break down everything from how to measure yourself to which styles work best for your body type.
How should a one-piece fit a rectangle body shape?
A one-piece should fit snugly through the torso without gaping. Look for styles with ruched sides, a defined waistband, or cutout details that create the appearance of a narrower middle. The right fit will hug your frame and add shape where you need it. If you are between sizes, we recommend sizing up for a more comfortable, flattering fit.