Plus Size Mother of the Groom Dresses: 7 Picks by Formality

The invitation has arrived, the bride’s mother has not said what she is wearing, and the dresses you like in your size have bare arms or the wrong length for the day. Buying the dress that fits and planning to find a shrug later can leave you with a jacket that does not match anything, or a gown that is right for black tie at an afternoon garden wedding. Below are seven dresses with a jacket, a cape or sleeves built in, matched to the dress code on the invitation, with the sizes each listing sells and a drawback for each.

The quick answer

Dress	Length	Arm cover	Sizes sold	Price
Alex Evenings Annabelle Jacket Dress	Tea	Jacket	14W to 24W	$249
Alex Evenings Bella Sequin Lace Dress	Tea	¾ lace sleeves	14W to 24W	$199
Alex Evenings Rebecca Soutache Gown	Floor	Puff sleeves	14W to 24W	$219
Kiyonna Maria Lace Evening Gown	Long	Lace sleeves	0X (10-12) to 5X (30-32)	$198
Kiyonna Lillian Embroidered Cocktail Dress	Midi	Flutter sleeves	0X (10-12) to 5X (30-32)	$238
Adrianna Papell Beaded Cape Taffeta Gown	High-low	Sheer beaded cape	Plus 14 to 26	$349
Adrianna Papell Cape Sleeve Sheath	Midi	Short cape sleeves	Plus 14 to 26	$219

Match the dress to the invitation

Choose an outfit suited to the time of day and the formality of the wedding, so start from the dress code on the invitation:

• Black tie: a floor-length evening gown or a dressy cocktail dress, both on the black tie list. How the codes differ is laid out in black tie vs white tie.
• Cocktail or semi-formal: Emily Post has no separate cocktail code; its semi-formal list includes a short afternoon or cocktail dress, a long dressy skirt and top, and dressy separates, with a note to err on the side of formality if the event is later than 6 in the evening. What the phrase covers is in what cocktail attire means.
• Length is yours to choose: Emily Post calls the length a personal choice, even for formal weddings, and the two mothers do not have to wear equal lengths, although many do, feeling it looks more harmonious in wedding photos.

On colour: traditionally the bride’s mother chooses first, and the groom’s mother then picks a colour that complements, but does not exactly match, what the bride’s mother and the attendants wear. Avoid colours the same as or very similar to the bride’s and bridesmaids’ dresses. The “colorless advice that the mother of the groom should wear beige, unless that’s her color” was retired long ago. If you have heard nothing, call the bride’s mother yourself. More dress-code and occasion guides are in events.

The seven

Alex Evenings Plus Annabelle Sequin Scoop-Neck Jacket Dress

$249 as of 28 Sep 2026 · 14W to 24W · View it on the brand’s site →

A tea-length sleeveless sequin dress with a matching jacket. The listing pitches the jacket as coverage for the ceremony and the sleeveless dress for the reception. Its fit notes give 50 inches from top of shoulder to hem on a 14W. It comes in two colours, navy and pewter frost.

Drawbacks: only two colours to fit around the bride’s mother; the fit notes say no bra cups; care is hand wash in cold water and lay flat to dry; and 24W, a 53-inch bust on the brand’s chart, is the top size.

Alex Evenings Plus Bella Sequin Lace Boatneck Dress

$199 as of 28 Sep 2026 · 14W to 24W · View it on the brand’s site →

A tea-length dress with a sequin lace bodice, three-quarter lace sleeves, a boatneck and a chiffon skirt, cut as what the listing calls “a mock two-piece silhouette”. It measures 46¾ inches from top of shoulder to hem on a 14W, and the listing names mothers of the bride or groom among the people it is made for.

Drawbacks: a mock two-piece is our reading of a single dress, so the top and skirt cannot be worn apart; hand wash in cold water.

Alex Evenings Plus Rebecca Soutache V-Neck Gown

$219 as of 28 Sep 2026 · 14W to 24W · View it on the brand’s site →

A floor-length empire-waist gown with soutache embroidery on the bodice, soft puff sleeves, a cascade ruffle skirt and built-in bra cups; the listing gives 59 inches from top of shoulder to hem on a 14W. It comes in six colours (navy, black, wisteria, deep plum, sky blue and wine), the widest colour choice of the seven. For a black tie or evening wedding where you want sleeves on a full-length gown.

Drawbacks: the sleeves are puffed rather than long; hand wash in cold water.

Kiyonna Maria Lace Evening Gown

$198 as of 28 Sep 2026 · 0X (10-12) to 5X (30-32) · View it on the brand’s site →

A long A-line gown in stretch floral lace (90 percent nylon, 10 percent spandex) with a surplice neckline, scalloped lace, lace sleeves and pockets, about 58 inches from the high point of the shoulder to the hem on a 2X. The listing adds a 1¼-inch seam allowance so the skirt length can be adjusted. The listing names the mother of the bride or groom among its wearers.

Drawbacks: on the listing’s Q&A the brand describes “flattering slim sleeves” and says the lace “has plenty of stretch for a comfortable fit”, but when a shopper worried about fuller upper arms it also suggested three flutter-sleeve gowns; dry clean only.

Kiyonna Lillian Embroidered Cocktail Dress

$238 as of 28 Sep 2026 · 0X (10-12) to 5X (30-32) · View it on the brand’s site →

A midi dress with a black mesh bodice, a surplice neckline, double-layer flutter sleeves, a shirred waistband and a floral embroidered skirt with godets for movement; about 45⅜ inches full length on a 2X. It is made in the USA, and the listing names the mother of the bride/groom among the people it suits. Of the two Kiyonna picks, this is the flutter-sleeve one to try if slim sleeves grip your upper arms.

Drawbacks: it is midi length, so at a black tie wedding it counts as the dressy cocktail dress on the list rather than the gown; dry clean only.

Adrianna Papell Plus Size Beaded Cape High Low Taffeta Combo Gown

$349 as of 28 Sep 2026 · Plus 14 to 26 · View it on the brand’s site →

A sleeveless mesh bodice with an illusion neckline under a sheer cape overlay hand-beaded in a floral motif, over a pleated taffeta skirt in a high-low shape, with side pockets; 62 inches from top of shoulder to hem. The listing calls it “perfect for black tie weddings, galas, or formal celebrations”.

Drawbacks: at $349 it is the most expensive of the seven; the listing calls the cape a “sheer cape overlay”, so it is not an opaque cover; the taffeta is listed as no stretch; the plus listing comes in one colour, light navy; spot clean.

Adrianna Papell Plus Size Cape Sleeve 3D Floral Stretch Sheath Dress

$219 as of 28 Sep 2026 · Plus 14 to 26 · View it on the brand’s site →

A midi sheath in very stretchy scuba (95 percent polyester, 5 percent elastane) with full-length princess seams, short structured cape sleeves and beaded 3D flowers along the boat neckline. The listing pitches it for “cocktail dress codes or daytime celebrations”: the pick for an afternoon or semi-formal wedding.

Drawbacks: the plus listing comes in one colour, pinot noir; our reading is that a close-fitting sheath shows more of your shape than an A-line such as the Maria; dry clean.

How to choose

• By the invitation: black tie points to the Rebecca, the Maria or the Adrianna Papell cape gown; cocktail or semi-formal to the Annabelle, the Bella, the Lillian or the cape-sleeve sheath. A dressy cocktail dress is on the black tie list too, so a tea-length or midi pick is not wrong there.
• By your measurements: Alex Evenings stops at 24W, a 53-inch bust and 56-inch low hip on its size chart, and says to size down if you fall between sizes. The Adrianna Papell picks are sold in Plus 14 to 26; the 26W row of its size guide is a 54-inch bust and 58.5-inch hip. Kiyonna’s chart runs to 5X (30-32) at a 61 to 66-inch bust and 66.5 to 71.5-inch hip, so above a 54-inch bust the two Kiyonna dresses are the ones in this list that reach you. Measure first with how to measure bust, waist and hips.

Before you order

• Leave time. Order your outfit at least two to three months ahead and allow at least two weeks for alterations.
• Take a colour reference. Bring a swatch of the bridesmaids’ fabric or a description of its colour when you shop, and check your size in that exact colour before ordering.
• Check the length on the listing. Alex Evenings’ dress-length chart lists plus tea length as 47 to 50 inches and long as 57 to 60 inches. Six of the seven listings give one length figure (the cape-sleeve sheath gives none); compare it with a dress you own.
• Read each store’s returns page before you buy, and try the dress on with your wedding shoes.

Where these numbers come from

Prices, sizes, fabrics and lengths are copied from each brand’s product listing, its product data and its size chart, read on 28 September 2026, in US dollars. Etiquette points are from Emily Post’s published attire and wedding guidance, and the notes on the mock two-piece and on fitted versus A-line shapes are our reading.

Frequently asked questions

What should the mother of the groom wear?

An outfit that suits the time of day and the formality of the wedding: a formal gown, a short or long dress, or a skirt-and-jacket ensemble all work on Emily Post's guidance. For black tie, a floor-length gown or a dressy cocktail dress; for semi-formal, a cocktail dress, a long skirt and top or dressy separates.

Does the mother of the groom have to wear a long dress?

No. Emily Post calls the length a personal choice, even for formal weddings, and says the two mothers do not have to wear equal lengths, although many do, feeling it looks more harmonious in wedding photos.

What colour should the mother of the groom avoid?

Colours that are the same as or very similar to the bride's and bridesmaids' dresses, and the same colour as the bride's mother. Traditionally the bride's mother chooses first and the groom's mother picks a colour that complements it without matching exactly.

How early should the mother of the groom order her dress?

Emily Post's advice is at least two to three months ahead of the wedding, with at least two weeks allowed for alterations.