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15TH ANNIVERSARY SALE: UP TO 80% OFF - EXTRA DISCOUNTS WHEN YOU BUY 2 OR MORE

Cosima | Elegant 3-Piece Set

£240.00

£69.95

Free Shipping with Royal Mail
30-Day Money-Back Guarantee
Loved by thousends of women across the UK
Colour Grey
Size UK 8 (S)

Only a few left in stock!

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UPDATE: As we celebrate 15 years side by side, only a limited number of items remain. If you can still click 'Add to cart', it’s still available.

The Cosima Elegant 3-Piece Set is designed for women who appreciate timeless sophistication, effortless comfort and versatile styling in one refined ensemble. Combining modern elegance with a relaxed luxurious feel, this beautifully coordinated set transitions seamlessly from daytime meetings to evening occasions without compromising on comfort or style.

Crafted from a soft lightweight fabric with an elegant drape, Cosima flatters the silhouette while allowing natural movement throughout the day. The clean lines and polished finish create a refined look that feels both modern and effortlessly wearable. Whether styled together for a complete elevated outfit or worn separately for endless combinations, this set quickly becomes a staple in any sophisticated wardrobe.

Perfect for office days, dinner plans, travel or relaxed everyday dressing, the Cosima set offers understated luxury that feels stylish in every season.

Why you'll love the Cosima set

• Elegant 3-piece design for a complete polished look

• Soft lightweight fabric with a breathable comfortable feel

• Flattering relaxed silhouette that drapes beautifully on the body

• Timeless minimalist styling suitable for both casual and sophisticated occasions

• Perfect for office wear, evenings out, travel and everyday elegance

• Easy to mix and match with other wardrobe essentials

• Designed for effortless comfort without sacrificing style

• A versatile all-season set that remains chic year after year

At Harriet Ellison, your satisfaction comes first. That's why we keep you updated on your order every step of the way, and always offer free shipping across the UK.

We ship with UPS, so your order arrives safely and on time.

If you don't love it, you don't pay for it. Return any item within 30 days for a full refund. No questions asked. Shopping with us is always completely risk-free. Some exemptions apply. To understand better, read here.

At Harriet Ellison, your peace of mind comes first. Every payment is processed through trusted, encrypted providers. Shop with complete confidence. Your information is always safe with us.

What our customers say


I thought the pieces might just look good online, but after receiving them I can see the quality is even better in person. So happy with my order!


Sophie Bennett, Bath, England

First received the wrong size, and I sent them an email and they immediately sent a new one. Good customer support.


Karen Mitchell, York, England

I thought boutique meant expensive but I got three beautiful pieces and now me and my sister both wear the beautiful dresses. We both love the dresses.


Katy Morgan, Cardiff, Wales

Great fit of the clothes and the quality is good! Use it daily for already 6 months and still super good. Highly recommended.


Emily Fraser, Edinburgh, Scotland


The packaging was beautiful and the dress was even prettier than I expected. The colours are gorgeous and it feels so light and comfortable on. I’ve already had two friends ask me where I bought it!


Wendy Clarke, Belfast, Northern Ireland

Just opened my order from Barbara Dever Boutique, the fabrics feel premium, and the cuts look great. My husband loves it!

I definitely made the right call.


Charlotte Evans, Swansea, Wales

Absolutely love this jacket! The fit is super flattering and it feels really high quality. Wore it to dinner last weekend and got so many compliments, I’ll definitely be wearing it a lot more!


Susan Fletcher, Harrogate, England

15 YEARS SIDE BY SIDE

Fifteen years ago, I started this boutique from scratch, chasing a dream I'd had since I was a young designer here in London.

From day one, I wanted every piece on our rails to feel the way I believe getting dressed should: comfortable, flattering, and effortlessly you.

Harriet Ellison Boutique is the result of that dream. Every piece is chosen, and often designed, with the same intention.

To celebrate 15 years since I opened our doors, I'm sharing some of the biggest discounts we've ever offered. My way of saying thank you to every woman who's shopped with us along the way.

With love,

Harriet Ellison 🤍

Free Shipping

Every order ships free across the U.S. Straight to your door, with tracking included. No surprises, no extra costs.

30-Day Money-Back Guarantee

If you don't love it, you don't pay for it. Return any item within 30 days. No questions asked. Shopping with us is always risk-free.

100% Secure Payment

Your payment is always safe with us. We use trusted, encrypted payment providers so you can shop with complete peace of mind.

Free Shipping

We offer Free Shipping for maximum customer comfort. Your satisfaction is important to us, which is why we offer smooth and free delivery.

30-Day Return Guarantee

Your satisfaction is our focus. Our 30-day return policy guarantees you maximum flexibility and the best shopping experience.

100% Secure Payment

We offer you a variety of secure payment options. Pay easily and enjoy a safe shopping experience.