How to Choose Your Dress Size Online
Shopping for dresses online can be frustrating due to wildly inconsistent sizing between brands. A size 12 in one shop might fit like a size 10 in another. The key to successful online shopping is ignoring the arbitrary size label and focusing entirely on accurate body measurements and fabric properties.
What we considered
- Accurate self-measurement
- Understanding fabric stretch and drape
- Reading brand-specific size guides
- Identifying international sizing differences
- Reviewing customer fit feedback
At-a-glance comparison
| Option | Best for | Main caution |
|---|---|---|
| Woven / Non-stretch fabrics | Structured dresses and formalwear | Requires exact measurements; size up if between sizes. |
| Jersey / Stretch fabrics | Casual dresses and bodycon styles | Highly forgiving, but excessive stretching can distort patterns. |
| Adjustable (Wrap/Tie) | Fluctuating sizes and diverse body shapes | Ensure there is enough fabric overlap for modesty. |
Recommended options
Bust, Waist, and Hips
These three measurements dictate how a dress will fit. Use a flexible tape measure over bare skin or well-fitting underwear.
Best for: All online clothing purchases
Keep in mind: Measurements must be taken parallel to the floor without pulling the tape too tight.
Sizing Up for Tailoring
If your measurements fall across two different sizes, purchase the larger size. It is much easier for a tailor to take a dress in than to let it out.
Best for: Formalwear and non-stretch fabrics
Keep in mind: Taking in more than two sizes can alter the garment's proportions.
Checking Regional Sizing
A UK 10, US 6, and EU 38 are generally equivalent, but variations exist. Always use the localized size chart.
Best for: Buying from international brands
Keep in mind: Asian sizing often runs significantly smaller than European or US sizing.
Taking Accurate Measurements
To find your true size, you need three measurements. Bust: measure around the fullest part of your chest. Waist: measure the narrowest part of your torso, usually just above the belly button. Hips: stand with feet together and measure around the fullest part of your hips and buttocks. Keep the tape measure snug but not tight.
The Danger of 'Vanity Sizing'
Retailer sizing differs by brand due to 'vanity sizing'—the practice of assigning smaller size numbers to larger measurements to make customers feel better. This is why you cannot rely on your 'usual size'. A brand's size guide is the only objective measure of how their garments are cut.
Factoring in Fabric
The fabric composition heavily influences fit. A dress made of 100% cotton or linen has zero stretch; if you are between sizes, you must size up. A dress containing 5% elastane or spandex will have significant give, meaning you can often safely order the smaller size if you prefer a fitted look.
Reading the Reviews
Customer reviews are a goldmine of sizing information. Look for reviews from buyers who share your height and weight. Many sites now feature sliders where customers rate whether a garment runs 'small', 'true to size', or 'large'. Trust the consensus of these reviews over the brand's official chart if there is a discrepancy.
Methodology
This guide is based on established tailoring principles and extensive analysis of online retail practices. We do not process orders or accept returns. Our goal is to provide research-led guidance to help shoppers reduce the environmental and financial costs of frequent online returns.