I Cup Bras

At Sans Complexe Paris, the I cup bra is one of the full bust sizes we care about most. Our flagship model for this shape is the Arum full cup bra, available up to I cup in four colours: White, Black, Skin and Magenta Purple. Cut for a deep cup, it offers a natural shape and support designed to accompany a full bust every day, without ever compressing. It's work we've been doing for years across our entire plus size bra collection.

The Arum full cup bra, in 4 colours up to I cup

White, black, skin, magenta purple

White and black remain the wardrobe staples for any outfit. Skin disappears invisibly under light-coloured clothing, and magenta purple adds a bold splash of colour for those who like to step outside classic shades. Find the full line in the Arum collection.

Lace designed for everyday support

The lace that dresses the Arum isn't just about looks. It's paired with full cups in microfibre that shape the bust without an aggressive underwire feel, giving a feminine finish while keeping all the support a cup as deep as I needs.

I cup, a deep cup: our benchmarks

An I cup corresponds to a 20 cm difference between the bust measurement taken across the fullest part and the underbust measurement. It's one of the deepest cups in our full bust lingerie range. A difference of just 2.5 cm is enough to move up a full cup size, which is why we always recommend re-measuring before switching styles, using our bra size guide.

Avoiding gaping at the top of the cup

A poorly fitted I cup bra often tends to gape at the top. That's a sign it isn't deep enough for the bust. Our Arum full cup styles are designed with a cup shape built to avoid exactly that, wrapping the bust properly right up to the top, including when seated.

Why wide straps matter at this cup depth

The deeper the cup, the more weight the straps have to carry. Wide straps distribute that weight better across the shoulders and reduce marks by the end of the day, an essential detail on a full cup bra worn every day.

Our Arum duo and trio sets in I cup

Finding an I cup bra that ticks every box (the right cup depth, suitable straps, support without compression) often takes several fittings. Once you've found the right style, it's worth making the most of it. That's exactly the appeal of the Arum bra multipacks: they let you stock up on colours in a fit you already know works, without starting from scratch with every purchase, and at a better price per bra than buying individually.

The Black and White duo remains the most versatile, covering both dark outfits and light-coloured tops. The Black and Skin duo is built for total invisibility under fluid fabrics, where even white can slightly show through. There's also a White and Skin duo for those who wear little black day-to-day, and a Black, White and Skin trio that brings all three essential colours together in one purchase to refresh your everyday I cup bra collection in one go.

These multipacks are currently only available in these three base colours. Magenta Purple, available individually up to I cup, isn't yet offered as a multipack at this cup depth.