Returns due to sizing in fashion e-commerce: causes, costs and how to reduce them

Online fashion retail has grown exponentially, offering convenience and variety to consumers. However, one of the biggest challenges remains: size-related returns. Understanding size returns in fashion e-commerce, their causes, costs, and how to minimise them is crucial to protecting margins and improving customer satisfaction.

In this article, we will look at:

• The reasons why customers return clothes.
• The economic impact of these returns.
• Strategies and tools to reduce returns in the fashion sector.

Why do customers return clothes?

The returns are common in online fashion: up to 30% of the losses end up being returned, with size and fit being the most common reasons.

Fit problems in fashion e-commerce

Fitting problems are the main cause of returns for various reasons:

• Variation between brands: a size M in one brand can be equivalent to a S or L in another.
• Lack of detailed information: very generic descriptions, such as “standard fit”, does not help clients make more informed decisions.
• Expectation vs reality: misleading photos that do not reflect the actual garment or its fit

Size inconsistency in fashion

Even within the same brand there can be some inconsistencies, causing frustration and increasing returns. This even occurs within the same product, with size deviations between the same model but different colours.

You can find out more about size inconsistency of denim here.

The cost of returns in fashion

Returns also have a significant logistical and economic impact:

• Operative costs: handling, inspection, re-packaging and re- sending.
• Reduced margins: products that are returned many times cannot be sold as new.
• Environmental impact: additional shipments increase the carbon footprint.

The cost of the returns in fashion can represent up to 20-25% of sales, making it is essential to implement strategies to reduce these figures

Strategies to reduce size- related returns

Minimising size-related returns requires a comprehensive approach: analysis, technology and communication.

Preventative measures in the product data sheet

• Detailed size guide: exact measurements in centimeters and adjusted to the garment.
• Size comparison charts: allow comparison with other brands or your own garments.
• Clear fit descriptions: indicate if the garment is “tight”, “regular” or “oversized”, for example.

Digital tools for the perfect fit

• Virtual try-ons and 3D simulation: to help visualise how the garment would look
• Size recommenders: algorithms based on purchase history and personal measurements.

Strategic return policies

• Make returns easy but encourage the right choice from the start.
• Offer options such as “exchange for another size” instead of a full refund.

Education and communication with the customer

• Precise instructions to correctly measure your body.
• Clear information about fit and possible variations for each garment.

Success case showing a reduction in returns

These cases show that investing in size and fit solutions improves the experience of the customer and the profitability. A real example of how a brand reduced size-related returns is Parajumpers:

• They implemented a size recommendation system based on historical purchase data and customer measurements. Thanks to this, they significantly reduced the size-related returns and also improved customer satisfaction.

To find out all the details and complete results of the case, you can download the Parajumpers success story here: https://naiz.fit/en/success-case-parajumpers/

Future trends in size management in fashion e-commerce.

The future focuses on technology and accurate data:

• AI and machine learning: personalised size recommendations according to purchase history and measurements
• Augmented reality and virtual try- ons: clients can “try-on” clothing online.
• Size standardisation: reducing sizing inconsistency, facilitating comparisons between brands.

Conclusion

Returns due to sizing issues in the world of online fashion are a constant but manageable challenge. Understanding why customers return garments, assessing the fashion returns cost and implementing effective strategies to reduce returns can transform returns into opportunities for loyalty and efficiency.

Investing in accurate size guides, digital fitting tools and clear communication strengthens customer confidence, reduces fit issues, and inconsistencies in sizing.

The combination of technology, data and customer-centric strategies ensures that every purchase is satisfactory, reduces costs and improves the sustainability of the operation, ensuring benefits for both customers and the business.