Knicker & briefs style guide

Choosing the right knicker styles is not just about fashion; it's about comfort and confidence. The perfect pairs can enhance your silhouette and provide comfort throughout the day. Keen to freshen up your underwear drawer? Keep scrolling for our comprehensive guide to help you find the pairs that suit your needs.

Shop our womens underwear range in-store or online via our Click & Collect nservice. Use our handy C&C store list to find your local Primark store.

Types of knickers

Full brief

Full briefs offer optimum coverage and everyday ease, making them a popular choice for those seeking comfort and support. The high waistband provides a snug fit, perfect for wearing under high-waisted trousers or skirts.

Best for: Everyday wear, maximum coverage.

Mini briefs

A smaller take on the classic brief, mini briefs sit lower on the waist with a higher-cut leg and slim sides for a lighter, more streamlined feel. They deliver a good amount of coverage while keeping a sleek, minimal look under clothes, making them perfect for everyday wear.

Best for: Everyday comfort with a lighter feel than full briefs. Less fabric at the waist makes these styles ideal for petite/short torsos.

Bikini briefs

Bikini-style knickers feature a classic waistband and sit lower on the hips than full briefs, combining style with comfort. Ideal for those who prefer a lower rise without compromising on support. These are flattering on most body shapes and pair well with mid-rise jeans or skirts.

Best for: Casual wear, moderate coverage.

High-leg/High-rise

High-leg or high-rise knickers are designed to elongate the legs, offering a modern underwear option. They sit higher on the waist, providing a flattering silhouette that pairs well with dresses and skirts.

Best for: Creating the effect of longer legs.

Brazilian

Brazilian knickers sit low on the hips with a cheeky back, offering great lift and a flattering shape. A flattering compromise for those who find thongs too minimal but briefs too modest, and perfect for occasions when you want to feel sexy and feminine.

Best for: Enhancing curves, cheeky style.

Hipster briefs

Hipster briefs sit low on the hips with full back coverage and a wider side panel for maximum support and comfort. Think of them as the laid-back sporty cousin to briefs and thongs, as these styles work well under hip-hugging denim or athleisure outfits. Look for seamless designs to avoid VPL.

Best for: Low-rise trouser lovers and those who love a laid-back style.

Thong

Thongs offer minimal coverage and no visible panty lines (VPL), making them suitable for tight-fitting outfits. Perfect for when discretion is key.

Best for: No VPL, minimal coverage.

Shaping/Seamless underwear

Shaping or seamless knickers provide smooth, figure-enhancing options. Available in both high-waist and mid-rise styles, their design helps to contour the body, making them ideal for form-fitting clothes and occasions where you’ll be photographed. Read our handy shapewear guide for more info.

Best for: A smooth silhouette and occasion dressing.

Boxer briefs/Boy shorts

Inspired by the laid-back look of traditional men’s boxers, boxer briefs or knicker shorts have a longer leg line than most traditional knicker styles, offering generous side and back coverage. Their soft and stretchy design often sits mid-to-low-rise, without sacrificing a flattering, feminine shape. Ideal for all-day lounging, layering under skirts and dresses or even as a sleepwear staple.

Best for: Relaxed comfort & full coverage.

Period knickers

Period pants look and feel like regular underwear but are designed with discreet, built-in absorbent layers to protect against leaks. Available in a range of fits, from high-waisted knickers for full coverage to low-rise bikini cuts and even thongs for lighter days. Find out how to use period pants in our helpful guide.

Best for: Leak protection with everyday comfort.

How to choose underwear for your body type

Understanding your body type can help you choose knickers that accentuate your best features:

• Hourglass: The waist is smaller than the hips and bust, with balanced proportions.

• Best picks: High-cut briefs or mini briefs help elongate the legs, while hipsters and boy shorts give balance.

• Apple shape: Fuller midsection and bust, with narrow hips and legs. 

• Best picks: High-waisted or control briefs smooth the tummy and help define the waist.

• Athletic/Straight shape: Hips, waist and bust are similar in measurement, with a straighter silhouette.

• Best picks: Styles like Brazilians, boy shorts, and hipsters add shape to the hips, while high-cut briefs help elongate the legs. Lace or textured fabrics can soften the silhouette for a more contoured look.

• Petite: Characterised by a shorter torso or smaller proportions overall.

• Best picks: Mini briefs or high-cut styles help elongate the legs and avoid overwhelming your frame. Opt for low-to-mid-rise fits for balance.

Best underwear material for women

Choosing the right material for your underwear can make all the difference in comfort and durability. Cotton is excellent for everyday wear due to its breathability. For special occasions, lace can add a touch of elegance, while materials like modal offer moisture-wicking properties for active days.

Types of women's underwear for specific outfits and occasions

Your underwear should complement your outfit and the occasion. Here are our recommendations:

• For tight/bodycon dresses, go for high-waisted shaping briefs or seamless thongs.

• For floaty dresses, go for bikini briefs.

• For suits that feature tailored trousers, go for seamless briefs or a seamless thong.

• For pencil skirts, go for high-waisted briefs or light, shaping knickers.

• For jeans and loose-fit trousers, go for hipster or bikini-style knickers.

• For leggings and activewear, go for seamless briefs or thongs made with cotton or modal fabrics.

• For formal and evening gowns, go for high-waisted shapewear or seamless styles.

Underwear care and maintenance

To help extend the life of your underwear, follow these simple care tips:

• Washing: Use a gentle cycle or hand wash to prevent damage. Avoid fabric softeners as they can break down fibres.

• Drying: Air dry whenever possible and avoid tumble drying to maintain elasticity.

• Storage: Store in a dry place, away from direct sunlight. Fold neatly to avoid stretching or damage.

FAQs

What is the difference between high-leg and high-rise knickers?

• High-leg knickers feature a higher cut on the leg, creating the illusion of longer legs. High-rise knickers sit higher on the waist, offering more coverage and support.

What are seamless knickers?

• Seamless knickers are designed without side seams, offering a smooth and discreet fit under clothes. They help prevent visible lines and are ideal for tight-fitting garments.

What is the difference between knickers and briefs?

• Knickers is a British term for women's underwear, while briefs refer to a specific style that provides full coverage and support.

How often should you replace your knickers?

• It's recommended to replace knickers every six to twelve months, depending on wear and condition. Regularly check for signs of wear, like sagging or loss of elasticity.

What knickers to wear to flatten your tummy?

• Shaping or high-rise knickers are ideal for helping give the illusion of a flatter tummy. Look for options with tummy control panels for added support and a smooth silhouette.