Joybuy Insights

Buying clothes online: how to choose the right size, material and fit without making a costly mistake

Buying clothes online is convenient, but an attractive photo doesn’t always tell you everything. A shirt, for example, may fit more loosely or snugly than you expect. A jacket described as waterproof may have different features from those you need for cycling every day. And a branded garment isn’t automatically right for your work, body shape or laundry routine.

Use these checkpoints to compare men’s clothing, women’s clothing, sportswear and accessories based on the details that really matter.

Three common pitfalls when buying clothes online

1. Relying on the size letter alone

A size L doesn’t mean the same thing across every brand. A slim-fit shirt sits closer to the body than a regular-fit shirt in the same size. European, British and American size labels may also appear side by side.

So don’t just look at S, M, L or XXL. Check:

  • the chest, waist and hip measurements in centimetres;
  • the stated fit, such as slim, fitted, regular or straight;
  • the sleeve and inside-leg length for shirts and jeans;
  • whether the garment is designed to fit close, normally or loosely.

2. Confusing marketing language with measurable features

Words such as “premium”, “sustainable” or “comfortable” aren’t complete product specifications in themselves. Check the fabric composition, construction and care instructions. Stretch jeans, for example, contain elastane, which tells you more about freedom of movement than a general claim about comfort.

For waterproof jackets, it’s worth checking whether they have a specific membrane, taped seams, a water-repellent finish and a suitable hood. A jacket’s product description may list its features, but how it performs also depends on care and weather conditions.

3. Overlooking care requirements and how you’ll use it

A garment that can only be washed at a low temperature or can’t go in the tumble dryer needs more attention. That doesn’t have to be a problem, but it should fit your routine. Before you buy, check:

  • the recommended washing temperature;
  • whether it can go in the tumble dryer;
  • whether it can be ironed, steamed or dry-cleaned;
  • how often a water-repellent coating needs to be reapplied;
  • whether the material is prone to fading or shrinking.

The key specifications to check

Materials and fibres

The fibres largely determine how a garment feels and how it needs to be cared for. 100% cotton is widely used for men’s shirts, polos and T-shirts. A blend with elastane may offer more stretch. Polyester is often lightweight and easy to care for, while wool or a wool blend can provide extra warmth.

Check the proportions, too. “Cotton blend” is less specific than a description such as 96% cotton and 4% elastane. For some sustainability claims, certification matters. If a product description says it contains organic cotton, check whether it has independent certification or whether this is simply a brand claim.

Fit and sizing

Choose a fit to suit how you’ll wear it:

  • Slim fit or fitted: ideal for a close-fitting business or smart-casual look, but less forgiving around the shoulders and stomach.
  • Regular fit: generally offers more room to move for everyday wear.
  • Straight fit: a practical choice for jeans, with a straight leg from the thigh down.

For plus-size clothing, it’s particularly important to check chest measurements, shoulder width and garment length. Going up a size doesn’t always mean you’ll get longer sleeves or a roomier cut.

Features and care

For sportswear or outdoor clothing, the details matter more than just the colour and brand. Look for zipped pockets, a hood, cuffs, ventilation and the type of fastening. For a rucksack, check the capacity, laptop compartment, carrying comfort and maximum recommended weight.

For a jacket with a water-repellent finish, follow the care label. According to The North Face product information, the DryVent material specified has taped seams and a Non-PFC DWR finish. These are verifiable product features, but they don’t guarantee that the jacket will keep you completely dry in every weather condition.

Our recommendations for different users

Suitable for: Budget-conscious beginners
Calvin Klein CK Essential Reg CN CK Black Men's XXXL

Calvin Klein CK Essential Reg CN CK Black Men's XXXL

Why it suits this profile: This black T-shirt is a simple starting point for an everyday wardrobe. Its regular fit and XXXL size make it a good option if you’re looking for a versatile basic.

How this product helps you avoid the pitfall

The product information specifies a regular fit, 100% cotton and detailed sizing. That means you don’t have to rely solely on the brand name or product photo.

Key benefit & highlights

100% cotton, classic crew neck, black colour, and suitable for wearing on its own or layering under a jacket.

Suitable for: Shoppers looking for top quality
Calvin Klein Poplin Stretch Slim Shirt Black Men's 39

Calvin Klein Poplin Stretch Slim Shirt Black Men's 39

Why it suits this profile: A smart choice for business wear and occasions when you want a more tailored look. The black colour is easy to pair with jeans or trousers.

How this product helps you avoid the pitfall

The stated size 39 and fitted cut give you more information than simply “medium” or “large”. The label also recommends washing at 40°C and not tumble drying.

Key benefit & highlights

Stretch poplin, Kent collar, fitted cut and a cotton-and-elastane composition.

Suitable for: Specific needs & intensive use
The North Face men's jacket NF0A8DY2 Estate Blue L

The North Face men's jacket NF0A8DY2 Estate Blue L

Why it suits this profile: Designed for men looking for a jacket for running, training or outdoor activities. The standard fit leaves room to wear a thin layer underneath if needed.

How this product helps you avoid the pitfall

The product information lists a hood, zipped pockets, taped seams and a DWR finish. Be sure to check the care label to help maintain these features.

Key benefit & highlights

100% recycled polyester according to the product information, standard fit, hood, and zipped chest and hand pockets.

Looking for more options?

We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.

Frequently asked questions about buying clothes online

How do I work out my clothing size when ordering online?

Measure a garment that fits you well and compare its chest, waist, sleeve or inside-leg measurements with the product’s size chart. Use the chart for the specific brand, as sizing varies by model and fit.

How can I tell whether an item of clothing is easy to care for?

Check the washing, drying and ironing instructions. Clothing that needs to be washed at 30 or 40°C and can’t go in the tumble dryer calls for a different routine from easy-care sportswear. Always follow the label, even if the general product description seems to say something different.

Is branded clothing automatically a good buy?

No. Branded clothing, such as Calvin Klein, Tommy Hilfiger or Levi’s, still needs to suit your size, needs and budget. Compare the material, fit, care requirements and practical details. A well-chosen basic that you wear often may offer better value than a garment bought mainly for its logo.