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Formal Dresses

Shop formal dresses, gowns, and cocktail styles! Find your perfect formal dress by exploring our dedicated Black Formal Dresses and Wedding Guest edits

Beginning Boutique Sunflower Brown Mesh Maxi Dress brown ribbed mesh deep V-neck sleeveless bodycon maxi dress with a flared hem
Beginning Boutique Perez Red Floral Cut Out Maxi Dress red and white floral V-neck maxi dress with white trim side cut-outs and tie front
Beginning Boutique Rhiannon Burgundy Stripe Knit Maxi Dress burgundy and white horizontal stripe knit bodycon maxi dress with spaghetti straps and scoop neck
Beginning Boutique Maddix Yellow Strapless Formal Maxi Dress light yellow strapless satin maxi dress with a fitted bodice and flowy skirt
Beginning Boutique Alima Chocolate Brown Cut Out Maxi Dress chocolate brown ribbed halter neck maxi with waist cutouts and ruching
Beginning Boutique Adria Yellow Strapless Asymmetrical Formal Maxi Dress pale yellow strapless bodycon maxi with sheer pleate
Beginning Boutique Lyanna Pink Sequin Maxi Dress pink sequin maxi with thin spaghetti straps and keyhole cutout
Beginning Boutique Chevelle Light Blue Halter Maxi Dress light blue smooth halter V-neck maxi dress with a flowy skirt
Beginning Boutique Oden Light Pink Formal Maxi Dress light pink satin maxi with cross-back straps and tie-back detail
Beginning Boutique Arizona Yellow Crepe Maxi Dress pale yellow strapless bodycon crepe maxi dress
Beginning Boutique Nakita Black Maxi Dress black satin deep V-neck maxi dress with thin spaghetti straps and side slit
Beginning Boutique Ely Yellow Lace Maxi Formal Dress pale yellow lace maxi dress with ruched satin bust and spaghetti straps
Side view of a yellow strapless maxi dress with a fitted bodice, gathered waist, and a high thigh split
Beginning Boutique Kim Red Strapless Ruffle Maxi Dress red strapless bandeau maxi dress with a fitted bodice and tiered ruffl
Beginning Boutique Isaiah Cream Strapless Mesh Maxi Dress cream strapless maxi with ruffled trim, ruched waist, and draped me
Beginning Boutique Marchelle Yellow Floral Sequin Maxi Dress yellow sequin maxi with pink lily print, scoop neck, and spaghetti straps
Close-up of the black thong heels with pearl-embellished straps and a square toe
Beginning Boutique Riles Black Strapless Ruffle Maxi Dress black strapless maxi dress with a smocked bodice and tiered ruffle skirt
Beginning Boutique Gloria Black Maxi Dress black halter neck V-neck ruched bodice flowy maxi dress
Beginning Boutique Cole White Polka Mesh Maxi Dress white polka dot off-shoulder ruched bodycon maxi dress
Strapless wine sequin maxi dress with a bodycon fit and bold red hibiscus flower pattern
Beginning Boutique Charlette Pink Knit Maxi Dress pink shimmery knit halter neck maxi dress with lace-up open back
Beginning Boutique Ryker Wine Strapless Mesh Maxi Dress wine strapless mesh maxi dress with twisted bust and sheer midriff cutout
Beginning Boutique Eliana Pink Orchid Maxi Dress pink orchid print halter neck deep V-neck bodycon maxi dress with side ruchi
Beginning Boutique Courtni Black Sequin Ruffle Maxi Dress black sequin mock neck sleeveless maxi dress with tiered tulle ruffle skirt
Beginning Boutique Taleah Navy Crepe Formal Maxi Dress navy crepe cowl neck maxi dress with thin spaghetti straps and side wa
Beginning Boutique Anica Black Off Shoulder Maxi Dress black satin off-shoulder maxi dress with draped neckline and side ruffles
Beginning Boutique Mellick Yellow Bloom Satin Maxi Dress yellow floral print one-shoulder satin maxi dress with waist cutouts and a leg slit
Beginning Boutique Arizona Pink Orchid Maxi Dress pink strapless bodycon maxi dress with fuchsia and red orchid print
Beginning Boutique Honey Blue Sequin Maxi Dress light blue sequin sweetheart neckline maxi dress with thin spaghetti straps
The side view of a strapless pink maxi-dress with a ruched bodice and a flowing skirt- adorned with a large pink and green floral print.
Beginning Boutique Tabitha Wine Off Shoulder Mesh Maxi Dress wine off-shoulder mesh maxi dress with bodycon bodice and sheer skirt
Beginning Boutique Joey Yellow Maxi Dress pale yellow satin maxi dress with spaghetti straps and a lace-up corset back
Beginning Boutique Merlo Red Crepe Strapless Formal Maxi Dress red crepe strapless maxi dress with ruched bodice and side ruffle detail
Beginning Boutique Alexia Yellow Strapless Maxi Dress light yellow strapless ruched bodice satin maxi dress
Navy crepe off-shoulder maxi dress with a fitted bodice and flowing skirt
Beginning Boutique Another World Pink Sequin Midi Dress pink sequin floral embroidered scoop neck midi with spaghetti straps
Beginning Boutique Elinor Lilac Satin Maxi Dress lilac strapless maxi with ruched sheer bodice and waist cutout
A long- light green knit dress with a deeply plunging cowl neck halter top and a form-fitting maxi-length skirt. This dress is suitable for a beach vacation or a resort outing.
Beginning Boutique Grayson White Long Sleeve Maxi Dress white V-neck long sleeve fitted maxi dress with ruched bodice
A long- light pink strapless maxi-dress with a ruched bodice- a tie detail at the waist- and a high leg slit. This elegant dress is suitable for a formal party or a semi-formal event.
Beginning Boutique Kim Pink Strapless Ruffle Maxi Dress pink strapless tiered ruffle maxi with high split and lace-up side
Close-up of the wine crepe maxi dress showing the square neckline and gathered bust
A long- strapless hot pink satin gown with a fitted bodice and a high leg slit adorned with ruffles. This elegant dress is suitable for a formal event- prom- or a gala.
A long- light pink satin gown featuring a deep V-neck halter neckline and a sheer lace bodice with an empire waist. This elegant dress is suitable for a formal event or a romantic evening.
Beginning Boutique Fallon Yellow Sequin Cut Out Formal Maxi Dress yellow sequin cowl neck maxi with spaghetti straps waist cu
A sophisticated black maxi dress with thin spaghetti straps and a subtle cut-out at the bust- accented with a gold hibiscus flower embellishment- suitable for a formal beach event.
A fuchsia one-shoulder maxi dress with bold red orchid prints- featuring a loose- flowing silhouette- ideal for a tropical evening event.
A fitted yellow maxi dress with large- bold red hibiscus floral prints- featuring thin spaghetti straps and a ruched tie-front bust.
Beginning Boutique Elowen Yellow Hibiscus Floral Halter Maxi Dress yellow hibiscus floral halter maxi dress with a front cutout and flowy skirt

Formal Dresses UK — Beginning Boutique

Get dressed up for your next big occasion with one of our stunning formal dresses from Beginning Boutique. Take your pick from our exclusive range of formal wear so hot you'll have everyone asking where you got your dress from! New arrivals drop weekly, so you'll always find the latest trends, styles, and fits — with so many styles to choose from, you'll be absolutely spoilt for choice.

What Colour to Wear to Formal?

Choose a colour that highlights your personality. Go bold with a red formal dress, radiate elegance in a strapless black formal dress, or opt for full glam in yellow or pink. We have a rainbow of choices, each designed to make you feel confident and completely yourself.

Recommended Formal Dresses for Weddings and Black Tie Events

Beginning Boutique has you sorted for every special occasion — from formals and weddings to cocktail parties and black tie events. Our ruched maxi dresses are perfect for a summer wedding guest look, and our flowy wrap dresses are absolutely stunning for bridesmaids. For black tie, choose a classic off-the-shoulder black maxi or a sleek long-sleeved bodycon. Or make a statement in a head-turning red formal dress — guaranteed to get you noticed!

Slip, Draped, or Belted — The Choice Is Yours

Whether you're drawn to a sexy slip style with a thigh-high leg slit, hot long-sleeve designs, or the perfect silhouette of a belted dress, our formal dresses are made from the best range of luxury fabrics — silky soft, with a natural sheen that hugs your curves perfectly.

What to Wear to a Formal Event

Your dress should reflect your unique style! Opt for a sophisticated evening gown, a sleek LBD, or a playful pink formal. Our collection ranges from timeless maxi dresses to trendy slip and wrap styles, perfect for any mood or theme. Our three most popular styles right now:

     
  • The Slip Midi Dress. A bestseller that's so chic — you'll look amazing as you dance the night away.
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  • The Slip Formal Dress. A full-length style with a thigh-high leg slit for that extra dose of glam.
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  • The Maxi Dress. A flawless, flowing piece that never goes out of fashion — a perfect choice for any ball.

From Flowy Gowns to Midi Dresses and Everything In Between

Feel like a princess in our flowy formal dresses, a style icon in a trend-setting one-shoulder design, or steal the show in our best-selling midi or a cute A-line. With so many effortless options in a wide selection of colours and fabrics, we have a dress to complement every confident babe.

Luxe Fabrics with the Ultimate Wow Factor

When only the best will do! Our formal dresses and cocktail gowns are designed in luxury fabrics — soft, smooth, and with a natural sheen and lustre that adds a sophisticated finish to every look. Once your dress is sorted, browse our heels to complete the outfit. Classic black strappy heels or stilettos go with everything, or go for wedges if you're in a summery mood.

Tips for Accessorising Your New Dress

We have a gorgeous assortment of fine jewellery to elevate your formal look. Pair your cocktail or formal dress with pieces from our accessories range — gold rings, zirconia stones, and gems — for a polished, head-to-toe finish.

Finding the Right Design and Size for You

We offer formal dresses and ball gowns in a full range of UK sizes 4 to 22, ensuring every style preference and silhouette is beautifully catered for.

Buying Your Formal Dress Online at Beginning Boutique

Shop your perfect formal dress online now at Beginning Boutique. We offer express shipping so you'll have your look sorted well before the big night. Your cart prices are in GBP for a smooth shopping experience, and with Afterpay you can wear it now and pay over 8 weeks — interest-free. Set up your account today to add items to your wishlist so you never miss a new drop!

Frequently Asked Questions

What does "formal" mean as a dress code?

Formal attire means a full-length or midi-length dress in an elevated fabric — think satin, chiffon, lace or velvet. It's the dress code for events like galas, awards nights, black-tie dinners and school or university formals. The expectation is polished and put-together — not just dressed up. As a general rule, formal means floor-length or midi in a refined silhouette, paired with heels and minimal but considered accessories. Jeans, casual fabrics and short dresses typically fall outside what formal events expect.

What's the difference between black tie and formal attire?

Black tie is the strictest level of formal dress code. For women, it traditionally means a floor-length gown, though a sophisticated midi in an elevated fabric is now widely accepted. Formal attire is slightly more flexible — a midi or tea-length dress works alongside floor-length options, and the fabric and silhouette requirements are a little less rigid. If the invitation says black tie, err on the side of floor-length and elevated fabrics. If it says formal, you have more room to work with length and style.

Can you wear a short dress to a formal event?

It depends on the event. For strictly formal or black-tie occasions, a short dress generally falls outside the dress code and risks looking underdressed. For a school formal, semi-formal dinner or a less traditional event, a knee-length dress in a dressy fabric can work. If you're unsure, check the invitation for specific dress code guidance. When in doubt, a midi is almost always the safest middle ground — it reads as formal without committing to a full floor-length gown.

What fabric is best for a formal dress?

Satin is the most popular choice for formal wear — it photographs beautifully, drapes well and looks expensive without needing much embellishment. Chiffon and georgette are strong options for more flowy or layered silhouettes and tend to be more comfortable over a long event. Lace adds texture and detail and works well for evening events. Velvet is a strong choice for winter formal events. As a general rule, avoid very casual fabrics like jersey, cotton or linen for formal occasions — the fabric is a significant part of what makes an outfit read as formal.

What's the difference between formal and semi-formal?

Semi-formal sits between smart casual and full formal. For semi-formal events, a knee-length to midi dress in an elevated fabric is appropriate — you don't need a full gown. Formal requires a higher level of dressing — typically a floor-length or structured midi in a more refined fabric, with accessories and shoes to match. If the invitation says semi-formal, a cocktail-length dress or a polished midi is the right call. If it says formal, treat it like a step up from that and go longer and more considered with the fabric and silhouette.