Let’s be honest—underwear doesn’t usually get the spotlight. We all wear it, we all need it, but it often ends up being the last thing we think about when refreshing our wardrobes. Yet, a great pair of pants or knickers can seriously improve your day, boost your confidence, and even help you feel more put together.
Whether you’re lounging at home in joggers, heading to the gym, or dressing for a big night out, what’s underneath matters more than we often admit. The problem? Shopping for underwear can be surprisingly tricky. Sizes vary between brands, styles seem endless, and not every pair lives up to its promises of comfort or support.
So if you’re based in the UK and you’ve ever struggled with fit, fabric, or figuring out what works for your body and lifestyle—this guide is for you. We’re covering everything: sizing, styles, fabrics, sustainable options, top UK-friendly brands, care tips, and shopping advice. By the end, you’ll be better equipped to shop smart, feel confident, and never again settle for underwear that bunches, chafes, or rides up.
Let’s get started.
Why Underwear Deserves More Attention
We wear underwear every single day. It’s the first thing we put on and the last thing we take off, so why do we treat it as an afterthought?
Here’s why choosing the right underwear matters:
- Comfort: Bad underwear can cause itching, sweating, or shifting throughout the day.
- Confidence: The right fit helps you feel good—even if no one else sees it.
- Health: Breathable materials and proper hygiene reduce the risk of irritation and infections.
- Clothing Fit: The wrong underwear can create awkward lines or bulges under your outfit.
In short, great underwear isn’t a luxury—it’s a daily necessity. And once you experience the comfort of a well-fitting pair, you’ll never go back.
Getting the Fit Right: Understanding UK Underwear Sizing
One of the biggest reasons people feel uncomfortable in their underwear is simply wearing the wrong size. This happens more often than you might think.
For Women
Women’s underwear in the UK typically follows clothing sizes (e.g. 8, 10, 12) or general letters (S, M, L). However, sizing can vary drastically between brands. Always use a tape measure and check each retailer’s sizing guide before buying.
- Waist: Measure around your natural waistline—just above your belly button.
- Hips: Measure the fullest part around your bum and upper thighs.
If you’re between sizes, opt for the larger size for everyday comfort or size down if you prefer a more secure fit for activewear.
For Men
Men’s underwear sizes are usually based on waist measurements in inches. A rough guide looks like this:
- Small: 28–30 inches
- Medium: 32–34 inches
- Large: 36–38 inches
- XL: 40–42 inches
If you’re unsure, pull out a measuring tape or use your trouser size as a reference. Also, remember that different cuts fit differently: trunks might feel tighter than boxers, and briefs may have more elastic tension at the waist.
Men’s Underwear Styles Explained
Not all pants are created equal. The right style depends on your lifestyle, wardrobe, and personal preference. Here’s a breakdown of the main types you’ll find on UK shelves (and online carts):
Boxers
Loose, breathable, and comfortable—boxers are a go-to for relaxed days or sleeping. They’re roomy and allow airflow, but they don’t offer much support, which makes them less ideal under slim trousers or for high-activity days.
Best for: Lounging, sleeping, or relaxed outfits.
Boxer Briefs
A hybrid between boxers and briefs, boxer briefs offer a snug fit and mid-thigh length. They’re supportive without being restrictive and work well under jeans, suits, and sportswear.
Best for: Daily wear, workouts, and layering under fitted clothing.
Trunks
Trunks are like boxer briefs but with shorter legs. They give the same support but with a sleeker, more modern silhouette. These are especially good for men with slimmer thighs or those who want minimal bunching.
Best for: Everyday wear, slimmer physiques, and tight clothing.
Briefs
Briefs have a classic Y-front design and offer maximum support without leg coverage. They’re great under suits, gym wear, or anything fitted. Some men find them more breathable, especially in warm weather.
Best for: Active lifestyles, fitted trousers, and hot days.
Jockstraps and Thongs
Less common, but increasingly popular for both performance and fashion. Jockstraps offer great athletic support, while thongs eliminate visible lines.
Best for: Sports, performance, or personal style preferences.
Women’s Underwear Styles Explained
Women’s underwear comes in more styles than ever, which is a blessing and a bit overwhelming. Here’s how to figure out which is best for your body and wardrobe.
Briefs
Full coverage across the front and back. They usually have a mid or high waist, making them excellent for all-day comfort or tummy support.
Best for: Everyday wear, comfort, and colder months.
Bikinis
A lower rise than briefs, with moderate back coverage. Bikinis are stylish and flattering for most body types and are a solid everyday option.
Best for: Versatility and comfort.
Hipsters
These sit on the hips and have more fabric across the bum and sides. They’re great under jeans and casual clothes.
Best for: Mid-rise jeans or low-waist trousers.
Thongs
Minimal coverage at the back, designed to avoid visible panty lines (VPL). Perfect for tight dresses or gym leggings.
Best for: Seamless looks under fitted clothing.
Boyshorts
Inspired by men’s boxers, these offer full coverage with a straight cut across the hips. They’re popular for lounging or sleeping.
Best for: Relaxation, extra coverage, and modesty.
Seamless or No-VPL Styles
These are made with bonded edges or laser cuts to lie flat under clothing. Great for bodycon dresses or any outfit where you want underwear to stay invisible.
Best for: Dressing up, smooth silhouettes.
Choosing the Right Fabric: Comfort Meets Function
Fabric isn’t just about feel—it impacts everything from breathability to hygiene. Here’s what you need to know about the most common materials found in UK underwear.
Cotton
A classic for a reason. It’s breathable, soft, and natural—perfect for everyday wear. Look for organic cotton if you want to avoid pesticides or support eco-friendly farming.
Pros: Hypoallergenic, affordable, breathable.
Cons: Holds moisture, can lose shape over time.
Bamboo
Soft, sustainable, and naturally antibacterial. Bamboo underwear is growing in popularity and is excellent for sensitive skin or sweaty conditions.
Pros: Moisture-wicking, eco-friendly, odour-resistant.
Cons: Can be more expensive, varies by brand.
Modal
Made from beechwood, modal is silky smooth and retains its shape well. It’s often blended with other materials for added stretch.
Pros: Lightweight, durable, soft to the touch.
Cons: Slightly more delicate; check wash instructions.
Microfibre/Polyamide Blends
These synthetic fabrics are often used in seamless or shapewear-style underwear. They’re smooth, stretchy, and great for VPL prevention.
Pros: Durable, stretchy, moisture-wicking.
Cons: Not as breathable; can trap heat if worn all day.
Lace and Mesh
Used more for design or lingerie purposes. Look for high-quality lace that’s soft rather than scratchy.
Pros: Aesthetic appeal, often breathable.
Cons: Delicate, may require hand-washing.
Sustainable and Ethical Underwear Options
Fast fashion is finally being challenged—and underwear is no exception. More UK shoppers are prioritising sustainability, and brands are responding with better materials, ethical production, and inclusive sizing.
What Makes Underwear Sustainable?
- Organic or recycled materials (e.g. organic cotton, bamboo, or recycled polyamide)
- Fair labour practices
- Reduced water and chemical usage
- Recyclable or plastic-free packaging
Top Eco-Friendly Brands in the UK
- Pantee: Made from deadstock t-shirts. Female-founded and inclusive.
- Stripe & Stare: BCorp-certified and known for using TENCEL™ modal, an ultra-soft and eco-friendly material.
- Thought Clothing: Focused on organic cotton and bamboo, with clean aesthetics.
- BAM Bamboo: Specialises in bamboo-based activewear and underwear.
- TALA: Ethical and size-inclusive, with innovative fabrics.
- Organic Basics: Danish brand but ships to the UK with low-impact packaging and ethical sourcing.
By choosing one of these brands, you’re supporting a fashion industry that values people and the planet.
Where to Shop: Online vs In-Store in the UK
Both online and brick-and-mortar stores have their pros and cons. The key is knowing which method suits your needs.
Shopping Online
This offers the widest selection, often better prices, and access to niche or sustainable brands. Most UK retailers have solid return policies, but read the fine print—some items (especially underwear) can’t be returned for hygiene reasons if opened.
Great places to shop online:
- M&S: Reliable quality and sizing.
- John Lewis: A wide range of brands and price points.
- ASOS: Excellent for choice, especially trendy or inclusive brands.
- Lounge Underwear: Popular for both style and comfort.
- Pants & Socks: Subscription service tailored for men.
Shopping In-Store
Sometimes, trying before you buy is best. High-street stores let you feel fabrics, check stretch, and ask for help from fit experts. Stores like M&S, Next, and Primark still dominate many UK high streets for a reason—they’re affordable and accessible.
Best for: First-time buyers, fussy fitters, or when you want instant results.
How to Care for Your Underwear (So It Lasts)
Even the best underwear won’t last forever, but proper care can extend its life significantly.
Washing Tips
- Use cold water or a 30°C cycle to preserve elasticity.
- Use mild detergent—harsh chemicals degrade fabric.
- Wash similar colours together to avoid bleeding.
- Use a mesh laundry bag for delicate items like lace or seamless styles.
Drying Tips
- Avoid tumble drying—heat damages elastic and can shrink cotton.
- Instead, air dry flat or hang dry, ideally indoors or in the shade.
When to Replace
- Elastic is stretched out
- Fabric is thinning or torn
- Discolouration or stubborn odours
- It just doesn’t feel good anymore
On average, most people replace their underwear every 6–12 months, depending on how often each pair is worn and washed.
Final Thoughts: Upgrade Your Drawer with Intention
If you’ve read this far, you’re already ahead of most people when it comes to understanding what makes a good pair of underwear. And here’s the truth: there’s no single “best” underwear. The best pair is the one that fits your body, matches your needs, and helps you feel like yourself—whether that’s soft bamboo briefs for lounging or bold lace thongs for nights out.
Don’t wait until your drawer is falling apart to make a change. Instead, start small—replace one or two worn-out pairs with something better. Try a new fabric. Explore a new brand. Consider comfort and sustainability just as much as price or style.
Because at the end of the day, the right underwear is more than a fashion choice—it’s self-care, comfort, and confidence rolled into one.
Ready to refresh your top drawer? Browse UK brands, try a new style, and discover what a difference great underwear can make.