Skip to main content Accessibility Policy

35% Off Best Sellers* - NO CODE NEEDED

Get up to 30% off your first DiaSHOP order* - code: DIAWELCOME

FREE US Standard Shipping on Orders $125+*

Card
Credit Card
Learn More
Don't have your card yet? Apply Today!
Enjoy these top rewards and special benefits when you use the FullBeauty Platinum Credit Card:

Earn Rewards⁶ Every Time You Shop

Earn 20 points for every $1 spent with your card. Available to Silver Tier Only (accumulate 0 to 3,499 points).³

Free Shipping up to 4 Times a Year⁴

Use promo code FBSHIPPING2025
Minimum purchase of $75. Online Only.

A Special Birthday Surprise!⁵

We'll send you an exclusive offer for your orders placed during your birthday month.⁵
Sign In
Rewards
0 My Bag

0 My Bag

Sign In
Rewards
Card
Deals
Personal Styling
New In
- Dresses
- Jumpsuits
- Tops
- Bottoms
  - Jeans
  - Pants
  - Skirts
- Outerwear
- Intimates
- Shoes
- Accessories
- Designers
- Female-Founded Brands
- Minority-Owned Brands
- Founded with Purpose
Dresses
Tops
Outerwear
- Jackets
  - Blazers
  - Vests
- Coats
Bottoms
Brands
Wedding Shop
- For the Bride
- Attending a Wedding
Style Edit
- What to Wear
- Best Sellers
  - Dresses
  - Jumpsuits
  - Tops
  - Sweaters
  - Outerwear
  - Jeans
  - Pants
  - Skirts
  - Intimates
  - Loungewear
  - Accessories
  - Designer
- Wardrobe Essentials
  - Bottoms
  - Dresses
  - Tops
  - Intimates
  - Sleepwear
- Featured
- Trending Now
Shoes
- Sandals
- Heels
- Flats
- Mules
- Bridal Shoes
- Wide Width
- Boots
- Slippers
Accessories
- Jewelry
- Belts
- Tights
- Sunglasses
- Hair Accessories
- Handbags
Sale
Personal Styling

Personal Style, Delivered
Get your customized
style box today!

Get Started

Shipping To

Be the first to Know

Stay up to date with all of our great fitting styles and new season arrivals. Plus, enjoy 20-30% off!

Email Address

Thanks for signing up.

Check your inbox to enjoy 20-30% off.

You have 48 hours to use your special offer before it expires!

Thank you for your interest in our brand and your request to receive emails! Unfortunately we are not able to accept orders from your country at this time or send you emails. As such, we will not store your email address at this time. We hope to be able to serve you in the future.

We're sorry, there was a problem adding your email to our list. Please try again later.

Customer Service

Help

Email Us

Call Us 1-800-400-5527

Quick Links

Track My Order

Return Order

Update My Profile

Introducing Dia Rewards! Shop & earn, and get rewarded. Join now (it's free!)

Home
Swim
Plus-Size One-Piece Swimsuits

Plus-Size One-Piece Swimsuits

85 Items

Clear All

SORT BY

85 Items

Clear All

Sort By

Featured

Newest

Top Rated

Highest Price

Lowest Price

FILTER BY

Clear All

Filter

10/12 (6)
14/16 (2)
18/20 (2)
22/24 (5)
26/28 (5)
30/32 (5)
ONE SIZE (1)
4 (15)
5 (1)
6 (15)
7 (1)
8 (35)
10 (38)
11 (1)
12 (39)
13 (1)
14 (53)
15 (1)
16 (55)
17 (1)
18 (54)
20 (54)
22 (45)
24 (43)
26 (40)
28 (12)
30 (13)
32 (12)
34 (7)
34 D (1)
34 DD (1)
34 E (1)
34 F (1)
36 E (1)
38 E (1)
3 (1)
21 (1)
23 (1)
XS D-E (1)
XS A-C (1)
XS F-G (1)
S D-E (1)
XXL D-E (1)
L D-E (1)
XL A-C (1)
XL F-G (1)
M D-E (1)
M F-G (1)
S F-G (1)
M A-C (1)
XXL A-C (1)
L F-G (1)
S A-C (1)
XL D-E (1)
L A-C (1)
XXL F-G (1)
38 H (1)
36 G (2)
36 H (1)
36 DDD (1)
42 H (1)
40 H (1)
34 DDD (1)
34 G (2)
34 H (1)
32 DD (1)
32 F (1)
32 E (1)
32 D (1)
32 G (1)
32 DDD (1)

black (59)
blue (55)
green (40)
pink (40)
multi (39)
white (37)
yellow (33)
beige (29)
grey (28)
silver (28)
purple (17)
red (17)
orange (16)
brown (6)

Avenue (6)
City Chic (6)
Cuup (2)
Elomi Swim (1)
Fantasie Swim (1)
Gottex (11)
Nomads Swimwear (6)
Profile By Gottex (6)
Swimsuits For All (35)
Trimshaper (2)
Unique Vintage (9)

One-Piece Swimwear (66)
Sets (1)
Swimdresses (17)
Swimsuits (83)
Wire Free / Wireless Bras (6)

Crinkle (3)
Crochet (1)
Elastane (24)
Jersey (5)
Knit (3)
Lycra (14)
Mesh (16)
Microfiber (1)
Nylon (61)
Polyamide (12)
Polyester (10)
Polyester Blend (1)
Silicone (1)
Spandex (44)

Adjustable (14)
Asymmetrical Hem (2)
Belted (3)
Built in Bra (24)
Bust Support (1)
Chlorine Resistant (8)
Collarless (41)
Comfort (83)
Compression (1)
Convertible (2)
Cut-Out (6)
Durable (1)
Empire Seam (2)
Fade Resistant (2)
Faux Wrap (5)
Fringe (1)
Glittered (2)
Handkerchief Hem (2)
Hemmed (19)
High Waist (3)
Hip Minimizer (6)
Lightweight (3)
Lined (56)
Long Lasting (1)
Made from Recycled Materials (1)
Made in USA (5)
Plush (2)
Pockets (1)
Printed (22)
Push-Up (1)
Quick Dry (2)
Ribbed (3)
Ruched (12)
Ruffles (10)
Slits (2)
Soft (2)
Solid (1)
Stretch Fabric (142)
Sun Protection (4)
Textured (3)
Tiered (2)
Tummy Control (43)
Twist Front (4)
Underwire (27)
Unhemmed (1)
Unlined (1)
UV Protected (20)
Wire Free / Wireless (42)
Zip Front (2)

Short Length (19)
Mid Length (2)

Sleeveless (67)

Halter (4)
High Neck (4)
Keyhole (1)
One Shoulder (4)
Scoop Neck (8)
Square Neck (10)
Strapless/Tube (10)
Sweetheart Neck (6)
V Neck (35)

Bootcut (2)

Hand Wash (83)
Machine Washable (2)

Swim (83)

Maximum Coverage (54)
Moderate Coverage (27)
Minimal Coverage (3)

Buckle (1)
Clasp (1)
Front Closure (2)
Hook & Eye (1)
Lace-Up (1)
Pull-On (68)
Pullover (12)
Snaps (3)
Tie (11)
Zipper (2)

Adjustable Strap (55)
Cross Back (4)
Shoulder Strap (4)

Maximum Support (16)
Moderate Support (60)
Minimal Support (7)

Up to $19.99 (1)
From $20.00 to $39.99 (9)
From $40.00 to $59.99 (7)
From $60.00 to $79.99 (10)
From $80.00 to $99.99 (15)
From $100.00 to $249.99 (43)

Unique Vintage Plus Size Rainbow Stripe Barbara One Piece Swimsuit
by UNIQUE VINTAGE

SFCC

$123.00
Color Options

Birds of Paradise

PothosNephrite

Black Bio

SkyGeode

Expressivo

IguanaMerlot

Coast One Piece II
by NOMADS SWIMWEAR

SFCC

Price reduced from $150.00 to $220.00 From $75.00 – $154.00
Color Options

BLACK

MINT

Coast One Piece
by NOMADS SWIMWEAR

SFCC

~~Price reduced from $145.00 to~~ $45.00 Save $100.00 69%

5.0 out of 5 Customer Rating (1)
Best Seller

Color Options

BLACK

RUBY

MILITARY

BEAUTIFUL BLUE

SPICE

Shirred Underwire One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $115.00 to~~ $103.50 45% Off! Use code: GRAB45
$56.92 with code
Save $58.08 51%

4.1 out of 5 Customer Rating (43)
Color Options

Expressivo

IguanaMerlot

SkyGeode

PothosNephrite

Black Bio

Birds of Paradise

Wave One Piece II
by NOMADS SWIMWEAR

SFCC

~~Price reduced from $210.00 to~~ From $105.00 – $210.00
Chain Accent Underwire One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $115.00 to~~ $103.50 45% Off! Use code: GRAB45
$56.92 with code
Save $58.08 51%

2.5 out of 5 Customer Rating (2)
Best Seller

Color Options

NEW GREEN LABYRINTH

BLUE ABSTRACT

PURPLE ABSTRACT

BLUE LABYRINTH

BLACK ABSTRACT

BLUE FLORAL

BRIGHT BLUE PALM

PINK UNDERWATER FLORAL

RED LABYRINTH

Chlorine Resistant Spliced Tank One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $94.00 to~~ $27.98 – $84.60 45% Off! Use code: GRAB45
From $27.98 – $46.53 with code
Save up to $66.02 70%

4.3 out of 5 Customer Rating (696)
Best Seller

Color Options

BLACK

MEDITERRANEAN

COOL BLUE FLOWERS

SPICE

PALM LEAF

DEEP SEA PURPLE

BRIGHT BERRY

ELECTRIC IRIS

MEDITERRANEAN PALMS

V-Neck One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $104.00 to~~ $93.60 45% Off! Use code: GRAB45
$51.48 with code
Save $52.52 51%

4.2 out of 5 Customer Rating (348)
Best Seller

Color Options

BLACK CHERRY

BLUE HAWAIIAN FLORAL

BLACK

ROYAL HIBISCUS

SUMMER TROPIC

BLACK WHITE ABSTRACT

RIO TROPICAL

DEEP SEA

High Neck Wrap Swimdress
by Swimsuits For All

SFCC

~~Price reduced from $130.00 to~~ $117.00 – $130.00 45% Off! Use code: GRAB45
From $64.35 – $71.50 with code
Save up to $65.65 51%

4.4 out of 5 Customer Rating (109)
Best Seller

Color Options

WARM STARBURST

BLUE STARBURST

BLACK BLUE OMBRE

GREEN ELECTRIC PALM

BLUE UNDERWATER FLORAL

BLUE ELECTRIC PALM

PURPLE ELECTRIC PALM

Chlorine Resistant Square Neck Tummy Control One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $94.00 to~~ 45% Off! Use code: GRAB45
$51.70 with code
Save $42.30 45%

4.0 out of 5 Customer Rating (192)
Best Seller

Color Options

SALTWATER HAPPY

LUXE

BLACK

ROYAL

PARADISE PRIMARY

VERY FUCHSIA

BRIGHT BERRY

Ruched Twist Front One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $104.00 to~~ $93.60 45% Off! Use code: GRAB45
$51.48 with code
Save $52.52 51%

4.1 out of 5 Customer Rating (685)
Best Seller

Color Options

BLACK

CASCADING BLOOMS

BLUE SHELLS

ROYAL

SALSA

Scoop Back One Piece
by Swimsuits For All

SFCC

~~Price reduced from $84.00 to~~ $24.98 – $75.60 45% Off! Use code: GRAB45
From $24.98 – $41.58 with code
Save up to $59.02 70%

4.3 out of 5 Customer Rating (3)
Best Seller

Color Options

GREEN BLUE OMBRE

PINK GEO SLICES

PAPAYA

MOD BLOOM

BLACK

ROSE

RIO TROPICAL

VITA BOHO PALMS

Bandeau Adjustable One Piece
by Swimsuits For All

SFCC

~~Price reduced from $84.00 to~~ $24.98 – $84.00 45% Off! Use code: GRAB45
From $24.98 – $46.20 with code
Save up to $59.02 70%

3.5 out of 5 Customer Rating (4)
Best Seller

Color Options

BRIGHT BERRY

BLACK

FLUORESCENT PINK

PAPAYA

EMERALD

Fringe Bandeau One Piece Swimsuit
by Swimsuits For All

SFCC

~~Price reduced from $104.00 to~~ $93.60 45% Off! Use code: GRAB45
$51.48 with code
Save $52.52 51%

4.5 out of 5 Customer Rating (558)
Color Options

BLACK

GRENADINE

PASSION FRUIT

ELECTRIC IRIS

Ruched Skirted Bandeau Swimdress
by Swimsuits For All

SFCC

~~Price reduced from $115.00 to~~ $103.50 45% Off! Use code: GRAB45
$56.92 with code
Save $58.08 51%

4.1 out of 5 Customer Rating (33)

Adjustable Ruched Swimdress
Underwire Lace Up One Piece Swimsuit
Chlorine Resistant Zip Front One Piece Swimsuit
Square Neck Mesh Cut Out Swimdress
High Neck Wrap One Piece Swimsuit
Braided Bandeau One Piece Swimsuit
Adjustable Sarong Swimdress
Cup Sized Mesh Underwire One Piece Swimsuit
Mesh Wrap Bandeau One Piece Swimsuit
Lattice Plunge One Piece Swimsuit
The Scoop One Piece - Swim
Tank One Piece Swimsuit
Coast One Piece
Ribbed V-Wire One Piece Swimsuit
Crochet Side Slit V-Neck Swimdress

Related Products

Plus-Size One-Piece Swimsuits
Best Plus Size One-Piece Swimsuit
Plus-Size Swim
Ladies' Plus Size Swimsuits
Plus Size Summer One Piece Swimsuit
Green Plus Size Swimsuit
Comfy Plus Size Swimwear
Plus-Size Swim Tops
Plus Size Traditional Swimwear
Plus-Size Swim Bottoms

Modern Plus Size One-Piece Swimsuit
Comfortable Plus Size One Piece Swimsuit
Elegant Plus Size One Piece Swimsuit
Flattering Plus Size One Piece Swimsuits
V-Neck Plus Size One-Piece Swimsuit
Plus Size Ladies Swimsuits
Plus Size One Piece Swim Dresses
Plus Size Fashionable One Piece
Plus Size One Piece
Plus Size Women's Swimsuits

Dia

Be the first to Know

Stay up to date with all of our great fitting styles and new season arrivals. Plus, enjoy 20-30% off!

Email Address

Thanks for signing up.

Check your inbox to enjoy 20-30% off.

You have 48 hours to use your special offer before it expires!

We're sorry, there was a problem adding your email to our list. Please try again later.

TText JOIN to 34806

for exclusive access to special offers & receive 20% off your next purchase!!

^*Msg&data rates may apply. Recurring autodialed marketing messages will be sent to the mobile number provided at opt-in.
Consent is not a condition of purchase. Text STOP to quit. T&Cs & Privacy Policy