What Is Sizing Like at Celtic & Co? An Honest Stylist’s Fit Guide

By Ella Blake – Senior fashion stylist & Founder | Tellar — Always honest, unbiased, & unsponsored post

Celtic & Co runs largely true to size across its core ranges — the sheepskin boots, tailored coats and denim are reliably accurate — but there are two big caveats worth knowing before you click buy. The knitwear is cut deliberately roomy, so a lot of people size down for a closer fit, and a handful of fitted tops and waisted dresses can feel snug across a fuller bust. In other words, the honest answer is: it depends entirely on the fabric. Let me walk you through it properly, range by range, the way I would if you were standing in my fitting room.

First, who are Celtic & Co?

For the uninitiated: Celtic & Co is a Cornish brand that’s been hand-crafting sheepskin slippers, boots and accessories for nearly thirty years, and has since grown into a proper natural-fibre wardrobe specialist — merino, lambswool, Donegal tweed, organic cotton, waxed canvas. It sits in that lovely “quiet quality” bracket: not fast fashion, not silly money, built to last for years. That heritage matters for sizing, because a sheepskin boot and a fine merino jumper behave nothing alike on the body.

Sheepskin footwear & slippers — do NOT size up

This is the one people get wrong most often. Genuine sheepskin feels tight across the toes and instep when it’s new, then beds in and moulds to your foot. So resist the urge to order a size bigger to “be safe” — you’ll end up swimming in them once they soften.

Whole size? Buy your normal size.
Half size? Size down (unless you habitually round up).
The sheepskin insole creates a personalised arch support as it moulds — brilliant, but only if you’ve fitted it snugly to begin with.

Their leather boots (the Woodsman and hiker styles) are true to size and roomier round the ankle and calf, so they layer beautifully over skinny jeans — good news if, like me, you do not have supermodel ankles.

Knitwear & jumpers — generous, so consider sizing down

Celtic & Co knits are cut with a deliberately relaxed, cosy ease — which is gorgeous for slouchy weekend layering but can read oversized if you want something neat. My own fashion fail here: I once ordered a Donegal wool jumper in my usual size purely because I loved the colour, and it arrived so generous I could have fitted a hot water bottle underneath. Lesson learned.

Want a closer fit? Take your size down one (a regular medium often works as a small).
Love a relaxed drape? Stick to your usual.
Their larger sizes are realistically and generously cut — a genuine plus if other “specialist” brands have let you down at a UK 16 or 18.

Coats & outerwear — check the fabric first

Celtic coats are investment pieces, and fit varies by construction. Double-faced wool tends to be true to size with room for a jumper underneath; sheepskin coats sit close and warm; waxed cotton has a touch more structure. As a rule I’d buy your normal size and only go up if you intend to layer chunky knits beneath.

Dresses, fitted tops & denim

Fitted tops & waisted dresses: size up if you’re fuller-busted — shoulder and bust proportions can run a little neat.
Narrow-sleeve jumpers: size up if you carry width on the arms.
Denim & jeans: true to size and consistently praised for fit — one of their safest buys.

My stylist verdict

Celtic & Co is one of the more honest sizers out there — reward them by buying for the fabric, not the label. True to size on boots, coats and denim; down a size on knitwear if you want sharp; up a size on anything fitted across the bust. Read the on-page reviews too; their customers are wonderfully candid about fit.

Love the look? Where else I’d shop

High street & heritage:

Seasalt Cornwall — the obvious soulmate; Cornish, natural fibres, brilliantly consistent sizing.
Fat Face — relaxed, outdoorsy knits and soft cottons that fit generously.
White Stuff — characterful, true-to-size everyday knitwear and jersey.
Joules — country-heritage staples, wellies and chunky jumpers.
Boden — dependable British quality with proper size charts.
Lands’ End — warm natural-fibre knits, famously true to size.
Barbour — the benchmark for waxed-cotton outerwear; size up to layer.
M&S — reliable lambswool and cashmere basics at sensible prices.

Premium:

The White Company — understated cashmere and cosy loungewear, true to size.
Me&Em — elevated knits and clever cuts that flatter a range of shapes.

Luxury / designer:

Max Mara — the queen of the wool and camel coat; an heirloom-grade upgrade.

And two left-field independents worth discovering:

&Daughter — a small British label crafting beautiful Irish and British wool knitwear with real provenance.
Findra — a Scottish independent making merino performance knits for life outdoors; quietly brilliant.

Stop guessing your Celtic & Co size

Tellar is the UK’s leading free sizing tool — your body matched exactly to 1,500+ brands instantly, so you never look at a size guide again. Measure once using your bust, waist, hip or an existing brand size.

Use the Store Size Lookup tool to get your precise size in any brand — COS, Reiss, Everlane, Arket & more.
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