The very best wedding guest dresses to shop now under $100.

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Peak wedding season is looming, which means it's time to scramble for a dress that is beautiful and suits the occasion, but doesn't break the bank. 

Whether it be black-tie, cocktail, or even a destination or tropical ceremony, the right dress should help you feel put together while fitting the mood of the day.

Watch: Exactly how early to buy your wedding guest dress, according to a fashion expert. Post continues below.

To save you hours of scrolling, we've curated the perfect list of wedding guest dresses under $100 that tick all the boxes. 

From strapless moments and asymmetrical necklines to colourful floral prints and flowy long sleeves, these options prove that you don't have to dent your bank account to look wedding-ready this season.

Pro tip: Don't buy too early! About six weeks out is the perfect sweet spot that will leave you feeling on-trend and organised.

Best black tie wedding guest dresses under $100.

Petal & Pup Amici Maxi Dress, $99.

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This simple yet elegant dress features a no-sleeve design, with gorgeous bow detailing at the back. Floor length, this dress is chic but comfortable.

Something For Sarah Jenibelle Maxi Dress in Wine Satin, $99.90.

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This gorgeous red dress is lightweight with a floaty silhouette, perfect for every season. 

SNDYS Calissa Maxi Dress $77.84, was $139.

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A silky maxi dress with a stunning asymmetrical neckline and draped bodice, in lightweight satin.

Azazie Pamela Olive A-Line Pleated Dress, $99.

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Captivating and classic, this A-line dress features a beautiful, tailored silhouette. So flattering and a gorgeous on-trend colour!

Petal & Pup Halter Neck Lace Maxi Dress, $99.

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A sleeveless design with an asymmetric high round neckline with a pop of lace, no notes.

Topshop Drape Shoulder Maxi Dress $94.50, was $135.

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A flowy satin maxi with such a pretty colour palette of florals, finished with an off-shoulder Bardot silhouette.

Best cocktail wedding guest dresses under $100.

Peppermayo Be Mine Satin Maxi Dress in Canary, $80.

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Lightweight with a draped silhouette, this dress is elegant and modern, and we love this colour.

City Chic Vivi Velour Midi Dress, $40 was $139.95.

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A soft stretch velour and asymmetrical midi, this colour is absolute perfection! And at $40 this one is a no-brainer.

Petal & Pup Logan Maxi Dress, $99.

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This cornflower blue gown is whimsical and classy, with a fit-and-flare waist, perfect for a rural or winery wedding!

Gingham & Heels Claudia Dress in Orchid, $99.

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Flowing and relaxed, beautiful colour palette. And you will be comfortable from day to night.

Petal & Pup Robbie Maxi Dress, $99.

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What an absolute chiffon showstopper!

Pretty Little Thing Slinky Off Shoulder Maxi in Sage, $62.50.

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This timeless maxi features a high neckline and back, with artful draping, so flattering, and we absolutely love the colour and silhouette.

City Chic Tiffany Strapless Midi Dress, $119.97 was $199.95.

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Yes, this one is $19.97 "over budget" but it was just too stunning not to include! Such a flattering, elegant and classic cut. And we just can't get enough of that colour.

Petal & Pup Solstice Maxi Dress, $89.

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This dress radiates confidence and effortless elegance. It's giving Andi in the final scene of How To Lose A Guy In 10 Days!

Boohoo's Chiffon Long Sleeve Maxi Dress in Lemon, $41.

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Breezy and boho chic, this dress exudes effortless elegance and is perfect for a summer wedding. 

City Chic Lara Dress $63.98, was $159.95.

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This fitted one-shoulder dress features luxe stretch fabric and an asymmetrical hemline. And that plum colour? So rich and luxe.

ids Billie Gathered Midi Dress, $99.95.

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A sexy midi dress with ruching, side split detail, surplice front and adjustable straps. Simply gorgeous.

Petal & Pup Ashe Midi Dress, $59.40 was $99.

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This is just too pretty, sweet and gorgeous.

Best smart casual wedding guest dresses under $100.

Petal and Pup Donata Maxi Dress, $89.

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Maxi dress with a halter neckline and a chic twist, this dress radiates timeless sophistication.

City Chic One Shoulder Dress $99.98, was $199.95.

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A sleek one-shoulder midi featuring a close-fit bodice and soft side drape detailing. On-trend chocolate colour. Gorgeous.

Topshop's Long Sleeve Ruched Maxi Dress in Chocolate Brown, $95.

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This long-sleeved option, fully covered front to back is modest and comfortable. And in a very cool on-trend chocolate brown.

Beginning Boutique Verlaine Beige Maxi Dress, $89.99.

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A geometric statement, this dress is classic, chic and also a very cool option.

ASOS DESIGN Poplin Maxi Dress With Volume Sleeves, $100.

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Unique and flowy, another great option for a wedding with a modest dress code. It's structured, classic elegance.

Romance by Honey and Beau Bella Midi Dress, $79.99.

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This strapless midi-length dress with bodycon fit is perfect for cocktail parties or special occasions. Such a pretty romantic colour.

Best tropical and destination wedding guest dresses under $100.

Petal & Pup Tani Midi Dress, $99.

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This midi-length dress features a deep v-neckline that adds a playful touch to the overall design. Love the texture and colour.

ASOS' Deep Cowl Maxi Dress in Striped Print, $95.

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A striped lemon moment which features a cowl neckline and a medium side split, this dress screams summer.

Billy J's Freya Maxi Dress in Black, $89.95.

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This long sleeve number is still summer-friendly with its off-shoulder element and flowy silhouette. 

Billy J's Balthazar Maxi Dress in Green/Blue Print, $89.95.

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Featuring dramatic puff sleeves and a tiny cutout on the bust, this maxi dress is the definition of both comfort and sophistication. Such a tropical moment.

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Feature image: @annabellerussell c/o @citychicofficial