How to Find Your Size in Anyday (M&S): The No-Faff Guide

By Ella Blake | Tellar Fashion Hub

If you want honest sizing advice for M&S's Anyday range, here it is upfront: Anyday runs true to standard UK sizing on most basics, but the cut is relaxed and generously proportioned — meaning if you're between sizes or petite-framed, sizing down one will almost always serve you better. I've bought enough Anyday pieces to know that going in blind without a quick size check is a gamble you don't need to take.

What Is Anyday, Exactly?

For anyone who hasn't come across it yet, Anyday is M&S's everyday essentials range — launched a few years back as their answer to the demand for decent quality, no-nonsense basics at a price that doesn't make you wince. Think wardrobe staples: jersey tops, simple trousers, casual knitwear, denim, loungewear. It's the range you reach for when you want something that looks put-together without overthinking it.

The quality punches well above the price point, which is why it's quietly become one of the most-shopped corners of the M&S website. That said, because it's designed as a range of everyday relaxed-fit pieces, the sizing does have a few quirks worth knowing about.

How Does Anyday Sizing Actually Run?

Let's talk specifics, because "true to size" means very little without context.

Jersey tops and T-shirts — These are cut generously. If you usually take a 12 for a relaxed fit, you'll likely get away with a 10. The fabric has good stretch so there's forgiveness here, but the torso length runs long.
Knitwear — Similarly oversized in the shoulders and body. I'd say size down one as a default unless you actively want that oversized look, which is very much on-trend right now.
Trousers and jeans — This is where it gets interesting. The waist tends to be cut large relative to M&S's own brand mainline, so if you're a pear shape (hello, me), go by your hip measurement rather than your usual waist size and adjust with a belt if needed.
Loungewear sets — The elasticated waists give you wiggle room, but the tops again run long and wide. Petite sizing is worth exploring even if you're not strictly petite height — the proportions will just sit better.
Dresses — The silhouettes are generally boxy and casual by design, so don't panic if the fit looks shapeless on the hanger. It's meant to be worn loose. If you like a more defined shape, size down and add a belt.

Ella's tip: I once ordered an Anyday ribbed long-sleeve in my usual size 10 and it arrived looking like a sack. Sized down to an 8, cinched it at the waist — absolute wardrobe hero. Don't be afraid to drop a size.

Petite, Regular or Tall — Does Anyday Cover All?

Yes, and this is genuinely one of Anyday's strengths. M&S offers the Anyday range in petite, regular and tall fits across many of the core pieces. If you're 5'3" or under, please use the petite option — not just for length but because the proportions of the garment (armhole depth, rise on trousers, neckline placement) are adjusted to suit a shorter frame. It makes a noticeable difference.

Tall options extend the hem and sleeve lengths without just stretching the proportions awkwardly, which I've found to be more thoughtfully cut than many high street equivalents.

How to Nail Your Anyday Size Every Time

The most reliable approach — and the one I now swear by — is to measure your bust, waist and hip in centimetres before you shop. M&S provides a size guide online, but since Anyday is relaxed-fit by default, I'd always cross-reference with Tellar's Store Size Lookup tool (more on that below). It takes your actual measurements and maps them directly to M&S sizing — no guesswork involved.

A few other things worth doing:

Read the fabric content before ordering — the more cotton in the mix, the less stretch, so sizing up on those pieces is sensible.
Check the "model is wearing" note: M&S usually states the model's height and the size shown. This is genuinely useful for judging length.
If in doubt between two sizes, size down for tops and up for trousers.

Brilliant Alternatives If You Love the Anyday Aesthetic

Anyday nails the relaxed-essential-wardrobe look, but if you want to explore similar territory across different budgets and vibes, these are the brands I'd point you towards:

Cos — The master of elevated minimalist basics. More expensive than Anyday but the quality is outstanding and the cuts are beautifully precise. Sizing is European so use a guide.
Hush — Brilliant for luxurious-feeling jersey and knitwear at a mid-range price. Sizing is very consistent and the brand is very good about publishing detailed measurements.
White Stuff — Particularly good for relaxed cotton pieces with a slightly more characterful edge. Great petite and curve ranges.
Boden — Underrated for quality basics. The sizing runs true and the classic fits hold up wash after wash.
Whistles — If you want to step up from Anyday into something that still feels effortless but looks more polished, Whistles is the natural next step.
The White Company — For jersey and knitwear specifically, this is the premium step up from Anyday. Sizing tends to run slightly small.
Me&Em — A brilliant British brand that does considered, grown-up basics with better fabric quality than most of the high street. Worth the investment.
Mint Velvet — If Anyday is your daywear fallback, Mint Velvet is the version for when you want the same relaxed silhouettes but with a little more style intent.

And two independent picks I love that you might not have come across yet: Colorful Standard makes genuinely gorgeous organic cotton basics in a huge range of colours — beautifully cut, ethically made, and the sizing is spot on. Sunspel is another quiet gem for classic jersey pieces; it's a British brand with a cult following and the quality is exceptional.

Never Guess Your Size Again — Use Tellar

This is exactly the kind of sizing headache that Tellar.co.uk was built to solve. It's the UK's leading free sizing tool — measure once and get your precise size across 1,500+ brands instantly. No downloads, no subscriptions, no faff.

Measure once — bust, waist, hip, or use an existing brand size you trust.
Use the Store Size Lookup tool — get your exact size at Anyday, COS, Reiss, Arket and over 1,500 more brands instantly.
Always free — works straight in your browser, no app required.

Plus, the Tellar Fashion Hub is packed with free, honest style guides written by real stylists — no sponsored content, no agenda, just genuinely useful fashion advice.