Joybuy Insights

Buying underwear online: how to choose a comfortable fit

Buying underwear online seems straightforward, but a good product photo doesn’t always tell you everything. The fit can vary from one brand to another, fabric compositions are sometimes described in broad terms, and a multipack isn’t automatically good value if the size isn’t right. A few simple checks can help you avoid disappointing purchases, whether you’re shopping for women’s underwear, men’s underwear, thongs, briefs or boxer shorts.

Three common pitfalls when buying underwear online

1. Relying on the size letter alone

S, M or XL isn’t a fixed standard. One manufacturer’s waist or hip measurements may differ from another’s. Always check the size guide on the product page. Some products list body measurements in centimetres, while others only give a clothing size.

Pay attention to the fit, too:

  • A low-rise style fits differently from a mid-rise or classic style.
  • A thong and a Brazilian brief offer less coverage than briefs or bikini briefs.
  • Trunks have shorter legs than many men’s boxer shorts.
  • An elasticated waistband can move comfortably with you, but it shouldn’t dig in or slip down.

2. Confusing marketing claims with verifiable features

Terms such as “silky soft”, “antibacterial” or “breathable” sound appealing, but always check the fabric composition and product information. If a brand claims a particular benefit, treat it as a claim made by the brand. According to the manufacturer’s own information, for example, a product may have a special finish or offer a particular comfort benefit; that isn’t the same as an independently verified result.

So, check in particular:

  • The percentages of cotton, modal, polyamide, polyester and elastane.
  • Whether the garment has seams, a gusset and an elasticated waistband.
  • Care instructions and any restrictions on tumble drying.
  • Whether the product is suitable for everyday wear, sport or travel.

3. Buying a multipack without checking the fit first

A 3-pack or 5-pack can be handy for everyday essentials, but may be less suitable if you haven’t tried the style before. If the fit is wrong, you could be left with several unworn pairs. For multipacks, also check whether all the items are the same colour, style and size.

The key specifications to check when buying underwear online

Fabric: choose according to how you’ll wear it

Cotton underwear is a practical choice for everyday wear. Cotton feels familiar and is available in different weights and blends. A percentage of elastane usually adds stretch and freedom of movement.

Modal underwear is often chosen for its soft, smooth feel. Products may also contain a modal blend with elastane or other fibres. Always check the official fabric details: the name in the product title may not match the percentages listed in the specifications.

For sports underwear, stretch and a smooth finish matter more than the fibre type alone. According to the product information, the Reebok Serena thong below is made from 92% polyester and 8% elastane and has a seamless design. This may be practical under sportswear, but remember to check the care instructions, too.

Fit and coverage

Choose a style to suit your clothes and everyday activities:

  • Women’s briefs and bikini briefs: suitable if you’re looking for more coverage.
  • Brazilian briefs: a middle ground, with a lower or more rounded back.
  • Thongs: minimal coverage and fewer visible lines under clothes.
  • Boyshorts: more fabric around the hips and upper thighs.
  • Men’s boxer shorts and trunks: extra coverage around the legs.
  • Briefs: a shorter style focused on support and freedom of movement.

A seamless style may be less visible under tight trousers or a dress. That doesn’t automatically mean it will be more comfortable for everyone. The right size, leg opening and rise still make all the difference.

Size, care and product information

For women’s underwear, measure your waist and hips at the points shown in the size guide. For men’s underwear, waist size is particularly relevant, but the height of the waistband and the length of the legs can also affect the fit.

Read the care instructions, too. Some items can be machine washed but shouldn’t be tumble dried. For example, the Calvin Klein 3-pack trunks are listed as machine washable, with tumble drying not recommended. If the care label on the item you receive differs from the online description, always follow the label.

Recommended choices for different shoppers

Suitable for: Budget-conscious beginners
Utree women’s modal underwear, 3-pack

Utree women’s modal underwear, 3-pack

Why it suits this shopper: A set of three is a practical choice if you want to buy several pairs of everyday women’s briefs at once and like having a choice of colours.

How this product helps you avoid the pitfall

The product information lists a 3-pack, available sizes and a stretchy fabric. Be sure to check the exact size and composition before buying.

Key benefit & highlights

The description mentions modal; the set includes three colours and a full-coverage style.

Suitable for: Shoppers looking for premium quality
Calvin Klein Brazilian briefs in grey

Calvin Klein Brazilian LV00QF8522

Why it suits this shopper: This style is aimed at anyone looking for a well-known brand, a low-rise Brazilian fit and a cotton-modal blend.

How this product helps you avoid the pitfall

The product description clearly states the cut and fabric blend. Compare this information with the size guide before ordering.

Key benefit & highlights

The cotton-modal fabric is described as soft and breathable; the low-rise Brazilian cut can help reduce visible lines under some clothes.

Suitable for: Specific needs & intensive use
Reebok Serena sports thong in black

Reebok Sports Thong Serena Black

Why it suits this shopper: This sports thong is designed for anyone who wants minimal visible lines and plenty of stretch during training.

How this product helps you avoid the pitfall

The product details specify the seamless design, fabric composition and 30 °C wash temperature. This makes it easier to assess whether it’s suitable for sport.

Key benefit & highlights

92% polyester and 8% elastane, a stretchy waistband and a design that stays discreet under sportswear.

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 requirements.

Frequently asked questions about buying underwear online

How do I find the right size when ordering online?

Measure your waist and hips with a flexible tape measure, then compare the results with the size guide for the specific product. Don’t automatically choose the size you wear in another brand. If you’re unsure, the product measurements matter more than the size letter.

How long does underwear usually last?

How long it lasts depends on the fabric, how often you wear it, the wash cycle and how you dry it. Elasticated edges can lose their shape more quickly if you often wash them at high temperatures or use a tumble dryer. Follow the care label and rotate several pairs. This means you won’t wear each garment as often.

Are multipacks of underwear better value?

A multipack can be practical once you know the fit and size. Compare the price per item and check how many pairs you’ll receive. If you haven’t tried the style before, it’s often wiser to try one pair first rather than ordering a large set straight away.