Joybuy Insights

Buying underwear: how to choose comfortable, well-fitting and practical underwear

Buying underwear may seem straightforward, but you often only notice a poor choice after wearing it for a few hours or after a few washes. A waistband that digs in, fabric that rides up or a size label that does not match your measurements can quickly make a purchase unusable.

Pay particular attention to these three common pitfalls:

  • Choosing a size based only on S, M, L or XL. Sizes vary by brand and style. Always check the waist and hip measurements in centimetres.
  • Confusing marketing claims with verifiable properties. Words such as “breathable”, “antibacterial” or “shaping” mean little without information about the material, construction and intended use.
  • Ignoring care requirements. Some fabrics should not be tumble-dried or machine-washed. Ignoring this can cause the elasticity and fit to deteriorate more quickly.

The key points when buying underwear

1. Choose the material based on how you will use it

Cotton underwear with elastane is suitable for many everyday situations. Cotton generally feels soft, while the addition of elastane provides extra stretch. One example is a composition of 95% cotton and 5% elastane, as found in various Calvin Klein and Reebok styles in the range.

For a smooth appearance under close-fitting clothing, consider seamless underwear. Polyamide, nylon, modal and elastane are often used for stretchy styles with less visible edging. However, check that the waistband and leg openings remain comfortable.

With women’s shapewear and shaping underwear, the construction is more important than the material percentage alone. According to the product description, a double layer around the tummy may provide additional control, but the effect and comfort vary depending on your body shape and size. Do not choose a smaller size to force a stronger result.

2. Check the fit and finish

Pay attention to the following details:

  • Waistband: elastic, but not so tight that it digs into your skin.
  • Leg openings: particularly important for women’s briefs and styles with longer legs.
  • Gusset or crotch area: check the lining and width when extra coverage is preferred.
  • Seams: a flat or seamless finish can feel more comfortable under lightweight clothing.
  • Style: women’s thongs prevent visible lines, while briefs or boxers offer more coverage.

For men, men’s boxers, trunks and hip briefs are different options. Longer boxers can provide more coverage around the upper thigh, while shorter trunks feel more compact. Also consider the rise and the shape of the front panel.

3. Check the size chart, not just the label

A product in 3XL is not automatically equally roomy across every brand. Compare your waist or hip measurement with the size chart on the product page. With plus-size underwear, the proportion between the waist, hips and leg openings is particularly important.

A style that is too small may ride up and create unnecessary pressure. One that is too large may shift around. If you are unsure, check the product information, fit description and returns policy before buying underwear.

Recommended choices for different situations

Suitable for: Budget-conscious beginners
REEBOK BRIEFS CARINA BLACK/WHITE/GREY MARL S

REEBOK BRIEFS CARINA BLACK/WHITE/GREY MARL S

Why it suits this profile: A 3-pack provides several everyday women’s briefs in different neutral colours, without having to mix and match individual pairs.

How this product avoids the pitfall

The product description specifies a composition of 95% cotton and 5% elastane and recommends washing at 30 °C.

Key benefit & advantages

3 pairs, cotton-elastane fabric and a seamless design according to the product information.

Suitable for: Shoppers looking for premium quality
Calvin Klein Hip Brief 3-Pack 100 3 White Men 3XL

Calvin Klein Hip Brief 3-Pack 100 3 White Men 3XL

Why it suits this profile: Suitable for anyone looking for men’s underwear with a classic cut, white colour and a generous size.

How this product avoids the pitfall

The size chart lists waist ranges and the product information states that it is machine-washable; however, check the current label before buying.

Key benefit & advantages

3 hip briefs, an elasticated waistband and a stated composition of 95% cotton and 5% elastane.

Suitable for: Specific uses & intensive users
Feelingirl Seamless High-Waist Tummy Control shaping garment

Feelingirl Seamless High-Waist Tummy Control Instant Smooth Shaped Low Rise Underwear Knickers for Women 3XL/4XL Brown

Why it suits this profile: An option for anyone looking for lightly shaping underwear for the office, home or a special occasion, and who needs a larger size.

How this product avoids the pitfall

The description specifies a double tummy layer, light shaping and sizes available up to 3XL/4XL. It is not a substitute for medical advice.

Key benefit & advantages

60% recycled nylon, 28% nylon, 9% spandex and 3% cotton; the manufacturer recommends air-drying only.

Suitable for: Travellers and hygiene on the go
YIJINCHAN Men's Disposable Pure Cotton Underwear 3-Pack

YIJINCHAN Men's Disposable Pure Cotton Underwear 3-Pack-XXL

Why it suits this profile: Practical for travel, sport or emergencies when washing and drying is inconvenient.

How this product avoids the pitfall

The product information states that the pairs are individually packaged and that XXL is suitable for a waist of 107–117 cm.

Key benefit & advantages

3 disposable boxer briefs made from 100% cotton, individually packaged and ready to wear.

Care determines how long it lasts

Always follow the care label, even when the product page provides general instructions. Cotton underwear can often be machine-washed, but elasticated edges may wear out more quickly due to high temperatures or tumble-drying. For seamless underwear and women’s shapewear, do not bleach, do not iron and air-dry are often part of the care instructions.

Wash new underwear before first use according to the label. Store it in a dry place and avoid prolonged exposure to high heat. This will generally help the fit last longer, without having to rely solely on marketing claims.

Looking for more options?

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

Frequently asked questions about buying underwear

How do I choose the right underwear size?

Measure your waist and hips with a flexible tape measure, without pulling it tight. Compare the result with the size chart for the specific product. For women’s underwear, you will generally need both waist and hip measurements; for men’s underwear, the waist is often the most important measurement.

How long does underwear typically last?

This depends on the material, how often it is worn, the wash cycle and drying method. Look out for signs such as slack elastic, thinning fabric, permanent discolouration or seams coming undone. An underwear 3-pack can help you rotate your pairs more often, meaning each individual pair is worn less frequently in succession.

Is seamless underwear always more comfortable?

Not necessarily. Seamless underwear may have less visible edging, but comfort also depends on the waistband, leg openings, fabric and size. So check the composition and fit rather than relying solely on the word “seamless”.