Last updated: September 2026
Finding a comfortable bra in a larger size shouldn't be hard — but too often the options are either heavily structured, wired and restrictive, or flimsy and unsupportive. This guide answers the questions we hear most: what counts as plus size, how much support you can realistically expect, and what to look for in a bra that fits well and feels good all day.
There's no single definition. In clothing, "plus size" usually starts around UK 16–18. In bras it's muddier, because bra sizing mixes band size and cup size — a 38C and a 40E might both consider themselves plus size, and both are right.
For our comfort bra we use simple S–6XL sizing based on your measurements rather than traditional cup sizing. The 6XL fits a bust of roughly 120–130 cm and covers around a UK 46E–F. If you measure yourself and match your centimetres to the chart, the size you land on is the one that fits — whatever the label says.
Underwire is one way to shape and lift, but it isn't the only one. Support in any bra comes mostly from the band around your body — a firm, wide underband does far more work than a wire ever does. A well-made wire-free bra with a broad band, wide straps and stretch construction can comfortably support everyday wear, including fuller busts.
What a wire-free bra gives up is structured shaping: less projection and lift than a rigid wired style. What it gives back is comfort — no wire digging in under the bust, no poking through the fabric, no red marks when you take it off. For sleep, lounging, work and daily wear, many women with larger busts prefer exactly that.
Read more in our guide to non-wired bras.
Use a soft tape measure in centimetres. Measure around the fullest part of your bust, then directly beneath it. Match both numbers to our size chart — if either measurement falls between sizes, choose the larger size for comfort.
Two quick checks once it's on: the band should sit level and firm without digging, and the straps should feel supportive without pressing grooves into your shoulders. If the band rides up or the straps slide, the size is wrong — a bigger size or a different fit will feel better than tightening the straps.
Our size guide includes UK, EU, Spain, France and Italy conversions from S to 6XL.
Larger busts often mean a bra that's on for longer — because taking it off is a relief, but going without isn't always an option. A lightweight, wire-free style changes that: it's comfortable enough to wear through the evening, to sleep in if you want to, and to forget you're wearing at all.
That's the brief we designed to. Our seamless comfort bra is unpadded, wire-free and pull-on, with a wide smoothing band, broad straps and breathable perforated panels. It comes in sizes S–6XL and eight colours.
Bras are £9.95 each, or pick any 3 — same colour or a mix — for £19.79. Free UK delivery in 7–14 working days, free EU delivery in 10–18, and a 30-day fit guarantee: if the size isn't right, we'll sort it.