Midlife women are all rushing to Marks & Spencer for the viral slip dress to wear under their floaty dresses this summer


If you want to wear your floaty dresses with absolute poise this year, the solution isn't a new dress - it’s the invisible layer underneath it


woman wearing a m&s slip dress© Supplied

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Leanne Bayley
Leanne BayleyDirector of Lifestyle & Commerce
April 9, 2026
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If you’ve spent any time on your social feeds today, you’ll have seen that the midlife fashion community has a new obsession - and that's M&S' new Body range but more specifically, the item causing a stampede at the M&S tills is the the Body Invisibles Flexifit Slip Dress.

For a woman over a certain age, summer dressing is often tricky to navigate . We crave the romance of those ethereal, oversized linens and the Boho-chic tiered midis currently dominating the high street. But the reality of wearing them? Less romantic. Between the sudden transparency of cotton in the afternoon sun and the frustrating way lightweight fabrics tend to cling to all the wrong places in the humidity, the effortless summer outfit can feel like an awful lot of... effort.

Enter the M&S slip.

M&S Body Invisibles Cool Comfort Full Slip

M&S Body Invisibles Cool Comfort Full Slip

The secret sauce is the Flexifit technology. Unlike traditional slips that feel like polyester or shapewear that leaves you gasping for air by lunchtime, this fabric moves in all directions. It’s designed to feel like a second skin and creates a seamless canvas under even the flimsiest of sundresses.

I'll be honest - I’d almost given up on my white linen midi. In certain lights, it was essentially an X-ray. I've tried traditional slips, but they never felt quite right. This M&S version is so thin it’s virtually undetectable. It’s the ultimate fixer for the midlife wardrobe.

One of the most persistent complaints for women navigating summer fashion is the dreaded static cling. There is nothing that ruins a silhouette faster than a beautiful silk dress bunching around the tummy area. The Invisibles range uses a low-friction finish that allows your outer layers to glide over your body, maintaining that floaty look. 

The slip comes in six shades which has women hitting 'Add to Cart' in their droves. Rather than a stark white - which can actually show through light clothing -the Opal tone acts as a neutral "nude" for lighter skin tones, disappearing completely under white linen, sheer broderie anglaise, and pale pastels. Darker skin tones will love Jasper, Sunstone or Zircon. 

As we head into the peak of the wedding and garden party season, this slip will sell out - don't wait for the heatwave to hit. At £20, these slips are easy on the purse strings, and will last you for years to come. 

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