Update your browser for a better shopping experience!

Get faster load times, stronger security and access to all features.

M&S

Firm Control Secret Slimming™ Full Slip

£29.50

Colour

Customers say:

Fits true to size()
Size

Free standard delivery over £60

Product code: T325931A

About this style

Sculpt your silhouette with this Secret Slimming™ full slip shapewear. The innovative microfibre fabric provides firm control to shape your body, tummy, waist and hips while remaining lightweight and comfortable. A regular fit that sits just above the knee offers complete coverage, with no visible knicker lines to disrupt your outfit. Pull-on styling and non-wired support make this M&S Collection lingerie undergarment effortlessly practical for everyday use. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Please don’t worry if the packaging name looks a little different, it’s still the same colour, our packaging just takes a little longer to update. Opaline formerly known as Almond.

Details & care

Item details

Model Height: 5ft11"/180cm

Model is wearing size: 16

Product Length: Short

Style

Pull on

Non padded

Control: Firm control

Features

Cool Comfort™ technology

keeps you cool all day long

Composition

63% polyamide, 37% elastane (exclusive of trimmings)

Care

Wash at 40°C

Do not bleach

Do not tumble dry

Do not iron

Do not dry clean

Delivery, collection & returns

Delivery

Standard

UK Standard Delivery is available for £3.99 or free on orders over £60 (excluding furniture).

Nominated Day

UK Next Day Delivery and UK Nominated Day Delivery (excluding Northern Ireland) are available for £5.99 (excluding furniture)

Collection

Collect from store

Store collection is free on all fashion, home and beauty orders.

Returns

UK returns

Free

Exclusions apply

Full delivery and collection informationOur returns policy

Reviews (363)

4.0

59% Recommended this product

Mentions
06 October 2025Amlucas
Verified Purchase

Fits well

fits well, difficult to take of due to snugness of fit. Otherwise happy with product

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

03 October 2025katzh
Verified Purchase

GREAT PRODUCT AT A GREAT PRICE!! Easy to wear.

Yes, I recommend this

GREAT PRODUCT AT A GREAT PRICE!! Easy to wear, versatile.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

28 September 2025AndewsJones
Verified Purchase

Perfect for the job

Yes, I recommend this

Believe it or not, I brought this full slip for my 87 year old mother who is very thin but has a hernia, this garment was a gamble but it worked wonders for her, supporting the hernia without wearing a belt. ☺️

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

13 April 202555Abbey
Verified Purchase

Useful slip

Yes, I recommend this

For me it is not particularly slimming, but I just wanted something to wear under a lace dress that is slightly transparent and this ticks the box. I am hoping it does not ride up, but as yet I have not worn it so can't comment.

Reviewer Ratings

Quality

Good

Value for Money

Good

Style

Good

How did it fit?

A bit small

Helpful?

Reviewer Ratings

Quality

Good

Value for Money

Good

Style

Good

How did it fit?

A bit small

11 April 2025CraftyJane1
Verified Purchase

Nice quality but didn’t work

Not easy to get on and didn’t give a smooth finish. Disappointing as M&S are my Go To for all things lingerie.

Reviewer Ratings

Style

Fair

How did it fit?

True to size

Helpful?

Reviewer Ratings

Style

Fair

How did it fit?

True to size

12 March 2025Kathryn 59
Verified Purchase

Good wardrobe staple

Yes, I recommend this

Excellent slip, great value and a must in any girl’s wardrobe

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

03 March 2025Giddyup12
Verified Purchase

Poor Product :(

No, I don't recommend this

Wore for just over an hour, the skirt part constantly rode up, at £30 this isn't acceptable so returned to store, given refund, should of read reviews before purchasing.

Reviewer Ratings

Quality

Poor

Value for Money

Poor

Style

Poor

How did it fit?

A bit small

Helpful?

Reviewer Ratings

Quality

Poor

Value for Money

Poor

Style

Poor

How did it fit?

A bit small

22 February 2025Patsy11130
Verified Purchase

Good overall.

Yes, I recommend this

Ideal to wear under a dress and feel slimmer! looks and feels great.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How did it fit?

A bit small

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How did it fit?

A bit small

16 February 2025Fabsuz
Verified Purchase

Not sure

So far the fit won’t stay but I didn’t wear it long enough to find out if I had to keep pushing the garment down.

Reviewer Ratings

Value for Money

Good

How did it fit?

True to size

Helpful?

Reviewer Ratings

Value for Money

Good

How did it fit?

True to size

06 February 2025Aoife

Disappointing

No, I don't recommend this

Having read the reviews I sized up. It was difficult to put on. My own size would have been uncomfortable and I suspect would still not have 'smoothed' or 'slimmed' anything. The material is not as firm as you would expect even though it said firm control on the packaging. The slip is not long enough and I'm not tall so I do think M&S need to address this issue. It felt as if it would ride up. Disappointing because I can see from reviews that others are satisfied, but I saw no benefit to wearing this item, so I'm returning it.

Reviewer Ratings

Quality

Fair

Value for Money

Fair

Style

Fair

Helpful?

Reviewer Ratings

Quality

Fair

Value for Money

Fair

Style

Fair

29 January 2025SRRR
Verified Purchase

Pleased customer

Yes, I recommend this

I am a size 8 and after reading reviews, ordered a size 10. Fitted snugly. I stepped into it which made getting it on easier. Very pleased. No riding up either.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

Small

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

Small

22 January 2025barbinotts
Verified Purchase

length issue

No, I don't recommend this

bought a larger size in the hope that it wouldn't be too short. that didn't work!

Helpful?

19 January 2025Kate141
Verified Purchase

Good product

Yes, I recommend this

Having looked at previous reviews, i sized up. I shouldn’t have. Although it smooths, it’s doesn’t reduce the excess skin etc 😂as much as I thought it would. I should have got my size. However, it is very comfortable to wear and does smooth out my figure in a dress or skirt. Good quality as I would expect from M&S

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Excellent

How did it fit?

A bit large

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Excellent

How did it fit?

A bit large

04 January 2025Jeanie66
Verified Purchase

Very snug fitting

Fabric looked good . However sizing a little confusing. I always wear M&S size 14 / 14 L in clothing . I ordered size 16 as didn’t want it too restrictive and still had difficulty getting it on. Therefore returned it.

Helpful?

02 January 2025Vics123
Verified Purchase

Better without

No, I don't recommend this

Bought 3 of these in different styles. None of them fitted very well. They were all too loose around my middle and so didn’t smooth my back at all which was my main reason for buying.

Reviewer Ratings

Quality

Excellent

Value for Money

Fair

Style

Poor

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Fair

Style

Poor

How did it fit?

True to size

21 December 2024Emsi
Verified Purchase

Great control slip

Yes, I recommend this

This is great holds you in just where you need it most.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

09 December 2024Anna Akroyd
Verified Purchase

Great value shapewear

Yes, I recommend this

Love this. Reasonably priced. Worn to smooth lines in dress. Great!

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How did it fit?

True to size

08 December 2024Netty89
Verified Purchase

Tummy control for Christmas

Yes, I recommend this

Excellent but not too tight so comfortable to wear but still plenty of support around the necessary areas!! Definitely would recommend

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How did it fit?

True to size

29 November 2024Gallifrey
Verified Purchase

Size up

Usually I’m a size 12 but as this was figure hugging opted for a size 14, which seemed too small and kept riding up and needing adjustments.

Reviewer Ratings

Quality

Average

Value for Money

Average

Style

Average

Helpful?

Reviewer Ratings

Quality

Average

Value for Money

Average

Style

Average

22 November 2024BeeCee123
Verified Purchase

Easy to wear but rides up

Good fit and very comfortable. Bought to wear under a dress for a dressy dinner. Gave a good shape but did ride up after a short time.

Reviewer Ratings

Quality

Good

Value for Money

Average

Style

Good

How did it fit?

True to size

Helpful?

Reviewer Ratings

Quality

Good

Value for Money

Average

Style

Good

How did it fit?

True to size

1 of 61