Plus Size Long Formal Dresses | Dia & Co

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+*

Top designers
& trends, curated
for sizes 10-32
Fashion first,
fit obsessed.
Sizes 14+
Your Life,
Your Style,
Your Avenue
Sizes 14-36
Elevated intimates
designed to support
in 67 sizes.
Confidently Current
Styles You'll Love
in Sizes 10-32
The Swim Experts,
Fitting Sizes 4-44

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

Call Us 1-800-400-5527

Quick Links

Update My Profile

Join Dia Rewards to earn while you shop.

Plus Size Long Formal Dresses

If you are not redirected automatically, click here.

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!

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.

Text JOIN to 34806

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

Sign up for texts

^*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

Free Exchanges Every Day

Free Exchanges Every Day!

Our goal is your complete satisfaction!

Learn More

Free US Standard Shipping

On All Orders $125+

Learn More

Customer Service

Contact Us
Shopping Info
Shipping Info
Exchanges & Returns
Billing & Payment
Size & Fit
International
FAQ

My Account

Sign In / Register
Track My Order
Return Order
Order History
Wishlist
Rewards

Diamond Rewards Mastercard^®

Pay My Bill

Gift Cards

Gift Card Balance
eGift Card

Pay My Bill

Gift Card Balance
eGift Card

Dia Shop

Careers
About Fullbeauty Brands
Product Collections

Shipping To

6 Brands 1 Easy Checkout

Your Privacy Choices

California Transparency in Supply Chains Act

Best Plus Size Clothing Brands

Accessibility Statement

Images may be AI generated

© FullBeauty Brands Operations, LLC. All rights reserved.

DIA SHOP™ is a trademark of FullBeauty Brands Operations, LLC.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Be the first to know

Be the first to know

Keep up with our latest offers, arrivals & more - it's easier than ever!

Mobile Phone Number

Success

You're all set!

A text message has been sent to . Reply with Y to confirm.

Something went wrong

Sorry, we are having trouble connecting to the system.

Please try again later.

^*By signing up for texts, you agree to receive automated recurring marketing messages from FullBeauty Brands and accept the Terms & Privacy Policy. Consent is not a condition of purchase. Msg & data rates may apply. Text Stop to unsubscribe.