Casual Underwear
Comfortable, well-fitting underwear is the foundation of every outfit, literally. Briefs, thongs, hipsters, boy shorts, seamless styles in cotton, modal, lace, and performance fabrics. We carry options from M&S, ASOS, and specialist brands across a wide range of sizes. Many featured brands offer inclusive sizing and sustainable fabrics. Use our filters to browse by style and fabric, or tell the AI stylist what you need.
Products
353 products
Marks & Spencer
M&S 5pk Cotton Modal High Leg Knickers Black
£12.00
New Look
New Look Light Blue Ruched Back Thong
£2.99
British Boxers
British Boxers Black Bamboo High Leg Knickers Pack of Four
£28.00
Marks & Spencer
M&S Dark Raspberry Mesh Knickers Pack of 3
£10.00
New Look
New Look White Spotty Lace Thong
£3.49
British Boxers
British Boxers Dusty Pink Bamboo High Leg Knickers Pack of Four
£28.00
Marks & Spencer
M&S 3 Pack Pointelle Brazilian Knickers Black Mix
£10.00
New Look
New Look Light Pink Ruched Back Thong
£2.39
British Boxers
British Boxers Women's Pack of Four Bamboo Knickers
£14.00
Marks & Spencer
M&S Rose Quartz Cotton Modal Full Briefs 5-Pack
£12.00
New Look
New Look Black Lace Thong and Bra Set for Plus Size
£7.99
British Boxers
British Boxers Light Blue Cotton Zip-up Hoodie
£69.00
Marks & Spencer
M&S Rose Quartz Cotton Lycra® High Leg Knickers 5-Pack
£12.00
New Look
New Look White Cherry Micro Lace Thong
£3.49
British Boxers
British Boxers Light Pink Bamboo High Leg Knickers Pack of Four
£28.00
New Look
New Look Light Pink Daisy Mesh Thong
£3.49
Marks & Spencer
M&S Oatmeal Mix Cotton Hipster Knickers 3-Pack
£8.00
British Boxers
British Boxers Bright Blue Bamboo Full Briefs Pack of Four
£32.00
New Look
New Look White Microfibre Lace Back Brazilian Briefs
£3.99
British Boxers
British Boxers Women's Pack of Four Ivory Bamboo Knickers
£28.00
Marks & Spencer
M&S Fresh Blue Lace Miami Knickers 2 Pack
£12.00
New Look
New Look Black Microfibre Short Briefs
£4.49
British Boxers
British Boxers Dusty Pink Bamboo Full Briefs Pack of Four
£32.00
Marks & Spencer
M&S Firm Control Full Briefs in Black
£15.00
Showing 240 of 353
Frequently Asked Questions
What underwear style is most comfortable for daily wear?▾
Highly personal, but mid-rise hipsters or briefs in cotton or modal are popular for all-day comfort. Seamless styles work best under fitted clothing. The key is finding something that doesn't dig in, ride up, or bunch. Our size guides per brand help get this right first time.
How often should I replace underwear?▾
Every 6-12 months depending on wear frequency. Signs: stretched elastic, faded colour, thinning fabric, loss of shape. Having 15-20 pairs in rotation ensures none are overworked. This is one category where new rather than preloved makes sense.
What underwear works best under tight-fitting clothes?▾
Seamless, bonded-edge underwear in a nude matching your skin tone. Thongs eliminate visible lines entirely. Laser-cut edges lie flat. Avoid lace edges, thick seams, or decorative details under figure-hugging garments, they show through more than you'd expect.