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Find Your Size
True to size with a sculpting four-way stretch. Between sizes? Size down for a snugger hold.
| Size | Bust | Under Bust | Waist | Cup | Torso | Length |
|---|---|---|---|---|---|---|
| S | 29.5" | 28" | 24" | 32B/C · 34B | 26.8" | 27.6" |
| M | 31.1" | 29.5" | 25.6" | 34C/D · 36B/C | 27.6" | 28.3" |
| L | 32.7" | 31.1" | 27.2" | 36D · 38C/D | 28.3" | 29.1" |
Description & Fit
Bold, sun-drenched and unmistakably confident — the Summer Sinner One-Piece is built for the days you want to be seen. A sculpting fit smooths and shapes through the waist, while the cut is designed to hold its shape swim after swim.
Cut & Fit
- Sculpting, figure-defining fit with light tummy control
- Flattering neckline with adjustable straps for a custom fit
- High-cut leg with a lengthening, cheeky-cut back
- Pulls on with ease
Lining & Fabric
- Double-lined for a smooth, second-skin finish
- 80% Nylon, 20% Spandex
Model Measurements
- Height 5'7" (170cm)
- Bust 32"
- Waist 24"
- Hips 36"
- Wears a Small
Care
Rinse Right After Every Swim
Chlorine, salt water and sunscreen residue break fibers down fast — a cool rinse straight after wear keeps the fabric and color intact.
Hand Wash, Cold Water Only
A gentle hand wash in cold water is all it needs. Skip the washing machine and the dryer entirely.
Dry Flat, Out of Direct Sun
Lay flat in the shade. Direct heat and sunlight fade color and weaken stretch over time.
Store Colors Separately
Especially with Hot Pink and Plum Red — store away from lighter pieces to avoid any color transfer.
Give It Time to Rest
Rotate between suits when you can. Letting the fabric recover between wears keeps the shape holding longer.
Shipping & Returns
Free Shipping on Duo, Trio & Squad
Solo ships for a flat $5. Duo, Trio and Squad ship free, automatically applied at checkout.
Processing Time
Orders are processed the same day and delivered in 5–11 business days.
60-Day Money-Back Guarantee
Test it against everything that's failed you before — chlorine, salt water, sun, a full day with the kids. Goes sheer, rides up, or lets you down? Full refund.
Simple, Human Returns
Reach out to our team at (support@sunsetsinner.com) and we'll walk you through it — no complicated hoops.
Real Sinners
Seen On Skin, Not Just Screens
Real Sinners
What They're Saying
Absolutely obsessed with this suit. I am 60 years old so this suit is for everyone. Very high quality, thick material and definitely shapes you in all the right places! Had never heard of this brand before.
Jennie S.
I’m 5’9 and 135ish lbs 32DDand this fit perfectly! The tight fit makes it very slimming
Mary S.
I’m not usually the one to spend this much on swimwear but now im absolutely convinced I need another one of these. The material is surprisingly very strong and it kinda feels like shapewear. And the fit is prefect. The only thing – if ure taller than me (im 175cm or 5’9) beware that it may be a little too short for your torso, so size up. I wear size S and my measurements are in cm [****]. It’s a little tight to get on w my wider hips but it fits like a glove. I usually wear medium to large in pants and small in tops
Magdaléna D.
I absolutely love this 1 piece! For reference I’m 5’3 and 140lbs, bra size 34D and I ordered the medium. I would say it’s a little snug on the girls but nothing unbearable. Color is a true red and gorgeous.
Jenice M.
I was skeptical at first because of the price but once you feel the quality you will be happy I promise. I got a medium I’m 5’3 132lb. This bathing suit makes you snatched!
christine c.
I am a 48 y/o woman who is a size small, weighing about 125 and I am in love with this suit! It is snug and snatches your waist in tight. Perfect fit and just enough to make you feel good about yourself. I have it in hot pink. Love it. It will be the suit I will choose all summer long!
Really like this swimsuit
Allyssa C.
I found I was in between a small and medium, so ordered both to try. It arrived to my address in Canada pretty quick - within a week. I had to get some help from customer service with the sizing once the suits arrived, and they were very helpful with feedback - as if I was actually at a store. My measurements are: 34 bust, 28 waist, 38 hips. The medium was a bit too wide in the bust for me, as my rib cage is fairly narrow, so I went with the small, and feel confident in it. I haven't tried it out in the wild yet, but looking forward to it's debut. Love the purple color.
Amanda
As other reviews stated, sizing runs small. I ordered a size S and I'm 5'4, 115 lbs and 32 d bra size for reference. The green color is a bit lighter than pictured. Very flattering, comfy material.
Grace
Great suit! Fits true to size for the most part, but if you are in between sizes, I would size up.
Olivia M.
Absolutely love!! The quality is worth the price. The low cut is very flattering. I’ll definitely be purchasing more colors! If you are between sizes I would say size up, the small was perfect!
Sydney
I rarely ever wear one pieces but I am OBSESSED with this one. It is SO SO fitting but I am able to be active without worrying about the suit. The color is absolutely gorgeous and one of my most complemented swimsuits. The quality definitely stands out and I will be purchasing more colors. 10/10 would recommend <3
Janel
So so cute and exactly as showed on advertisement. I went for the Large just to be safe and I did have to tighten the shoulder straps a little bit because the top part was loose. It’s not super tight it has a little give so idk if the medium would have fit better or not. For reference I’m 5’10, 165 lbs and wear a size 32D. Definitely when I tightened the straps it gave me a more thong look in the back
Erica Palmer
Very slim fit and super sexy! Covers everything but still gives you your figure! Has good support for more busty women like myself.
Kayla
Good To Know
Questions, Answered
How do I know what size to order?
True to size with a sculpting four-way stretch. Between sizes? Size down for a snugger hold.
| Size | Bust | Under Bust | Waist | Cup | Torso | Length |
|---|---|---|---|---|---|---|
| S | 29.5" | 28" | 24" | 32B/C · 34B | 26.8" | 27.6" |
| M | 31.1" | 29.5" | 25.6" | 34C/D · 36B/C | 27.6" | 28.3" |
| L | 32.7" | 31.1" | 27.2" | 36D · 38C/D | 28.3" | 29.1" |
Will it be see-through when wet?
No. The double-lined fabric stays fully opaque wet or dry, so you can move, swim and stretch without worrying about it.
How long will my order take to arrive?
Orders are processed the same day and delivered in 5–7 business days. Solo ships for a flat rate depending on your location — Duo, Trio and Squad ship free. You'll get tracking as soon as it's on its way.
What if it doesn't fit or I change my mind?
You're covered by our 60-day money-back guarantee. Reach out to our team at (support@sunsetsinner.com) and we'll take care of it — no complicated hoops.
Is the color true to what's shown in photos?
We shoot in natural light to keep colors as accurate as possible, but every screen renders slightly differently. If it's not right when it arrives, you're covered by the 60-day guarantee.
What if I have a question after I order?
A real person is behind every order. Reach out any time at (support@sunsetsinner.com) and we'll get back to you directly — no bots, no runaround.