Oliver Bonas Sizing Guide: Does It Run Big or Small? The Complete Truth About Their Fit
Author: Stylist at TellarDate: 2025
The Oliver Bonas Sizing Reality Check
I've been styling women for over a decade, and Oliver Bonas consistently surprises newcomers with their generous approach to sizing. Unlike brands that have shifted towards smaller cuts over the years, Oliver Bonas maintains what I'd call 'classic British generosity' in their fits.
The overwhelming consensus from my clients and online reviews is clear: if you're between sizes, always go smaller. One of my regular clients, typically a size 12 across most brands, consistently wears a size 10 in Oliver Bonas dresses and finds them perfectly fitted rather than tight.
This generous sizing extends across their entire clothing range - from their popular midi dresses and statement blouses to their knitwear and outerwear. It's particularly noticeable in their dress collection, where the cut tends to be quite forgiving around the bust and hips.
How Different Garment Types Fit
Dresses
Their dresses are where the generous sizing is most apparent. The wrap styles flow beautifully without clinging, whilst their fit-and-flare designs offer plenty of room through the bodice. I always advise clients to order their smaller size here, especially for special occasions where you want a more tailored look.
Knitwear and Tops
Jumpers and cardigans from Oliver Bonas tend to run large, particularly through the body. Their cotton pieces have a relaxed, lived-in feel that's perfect for weekend styling but can look oversized if you stick to your usual size.
Tailoring
Blazers and structured pieces maintain the generous fit, though this works well for layering. The shoulder line is typically spot-on, but expect extra room through the waist and torso.
Where to Shop Similar Styles with Better Size Consistency

High Street Heroes
COS - My go-to for minimalist pieces with excellent size consistency. Their Scandinavian approach to fit is reliable and their quality rivals much pricier brands.
Zara - Fast fashion done right with trend-led pieces that fit true to size. Perfect for updating your wardrobe with Oliver Bonas-style statement pieces at a fraction of the cost.
Whistles - British contemporary brand offering sophisticated pieces with reliable sizing. Their dresses share Oliver Bonas's feminine aesthetic but with more predictable fits.
Jigsaw - Excellent for workwear and weekend pieces with consistent sizing across their range. Their colour palette often mirrors Oliver Bonas's aesthetic sensibilities.
French Connection - Great for statement dresses and bold prints reminiscent of Oliver Bonas's style, with much more reliable size guides.
Monsoon - Perfect for bohemian-inspired pieces with Oliver Bonas vibes. Their sizing runs true to size, making online shopping much easier.
Anthropologie - Similar aesthetic to Oliver Bonas with that curated, unique feel. Sizing is more consistent, though still worth checking individual reviews.
Premium Picks
ME+EM - British brand offering elevated basics with impeccable fit and finish. More expensive than Oliver Bonas but worth it for staple pieces.
Reiss - Contemporary British brand with reliable sizing and sophisticated styling. Perfect for investment pieces that share Oliver Bonas's modern aesthetic.
Luxury Alternatives
Ganni - Danish brand offering quirky, feminine pieces with excellent quality and consistent European sizing.
Zimmermann - Australian luxury brand for those special occasion pieces with Oliver Bonas's romantic aesthetic but superior construction and fit.
Independent Gems
Rixo - London-based brand creating vintage-inspired pieces with modern fits. Their dresses have that same statement quality as Oliver Bonas but with more structured sizing.
Ghost - British brand specialising in flowing, feminine pieces with bias-cut dresses that flatter every figure. Their sizing is remarkably consistent across their vintage-inspired range.
My Professional Styling Tips
When shopping Oliver Bonas, I always recommend ordering two sizes if you're unsure - their excellent returns policy makes this risk-free. Pay particular attention to fabric composition; their natural fibres tend to be more generous than synthetic blends.
For petite women, Oliver Bonas can be particularly challenging as the generous sizing combined with longer proportions can overwhelm smaller frames. Consider alterations for their beautiful statement pieces.
If you're buying for special occasions, always size down and have a backup plan. Nothing's worse than a gorgeous dress arriving too large the day before an event!
Take the Guesswork Out of Online Shopping
Tired of sizing roulette when shopping online? tellar.co.uk is the UK's leading sizing tool that matches your body exactly to over 1500 brands instantly. Never look at a size guide again!
How Tellar Works
- Measure once using your bust, waist, hip measurements, or your existing brand size
- Use their tellar.co.uk
- tellar.co.uk
- tellar.co.uk - because life's too short for ill-fitting clothes!
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