What Is Sizing Like at Trespass?

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

Trespass sizing runs generously through its outerwear — coats and jackets are cut deliberately roomy so you can layer underneath — while fleeces, midlayers and base layers sit much closer to the body. So the honest answer to “what size am I at Trespass?” is: it depends entirely on what you’re buying. This is a Scottish outdoor brand (going since 1984) built around skiwear, waterproofs and walking kit, and the cut reflects that purpose rather than a flattering mirror in a fitting room. Let me break it down properly, garment by garment.

Jackets and coats: built for layers

This is where most people get caught out. Trespass cuts its insulated jackets, padded coats and waterproof shells with deliberate breathing room so you can wear a fleece or a down midlayer underneath without feeling like a stuffed sausage. The result is that they often come up a touch large.

I learned this the hard way before a trip to the Cairngorms. I ordered my usual 12 in a padded parka, assuming “outdoor brand, size up”, and ended up with something I could have smuggled a small child inside. Lesson learned: for everyday wear over a jumper, take your true size. Only size up if you genuinely plan to stack thermal layers underneath for serious cold.

Everyday wear (jacket over a jumper): stick to your true size.
Serious layering (base + fleece + down): size up by one.
Between two sizes: go down for a tailored look, up for room to move.

Fleeces and midlayers: closer than you’d expect

Here’s the trap. Because the outerwear runs big, shoppers assume everything does — then their fleece arrives clinging in all the wrong places. Trespass fleeces and midlayers, particularly in the women’s range, are cut noticeably more fitted, because they’re designed to sit neatly under a shell rather than flap about. If you like a relaxed, throw-on fleece for the school run, I’d nudge up a size from your jacket size. If you want it as a trim middle layer, take your true size and enjoy the snug fit.

Ski and snowboard kit: trust the chart

Counterintuitively, Trespass ski and snowboard jackets are the most reliable items in the whole range — they fit very close to the published measurements, so this is the one time I’d genuinely measure yourself and follow the chart rather than guess. Want that fashionable baggy snowboard silhouette? Size up by one. Prefer a sleeker, piste-ready line? Stay on your measurement. Ski trousers are the wildcard, as the fit swings hugely depending on stretch fabric and intended mobility, so check each product individually.

Base layers and boots

Base layers and thermals come up small — they’re meant to, for that second-skin warmth — so resist the urge to size up here or you’ll lose the heat-trapping benefit. For walking boots, I always go half a size up to leave room for thick hiking socks; nobody enjoys a blister three miles from the car.

Where I’d shop for outdoor style

Trespass is brilliant value, but if you’re building a wider outdoor and weekend wardrobe, here’s where I’d send clients across the price spectrum.

High street & everyday outdoor

Fat Face – soft, casual outdoor staples that work just as well in a coffee shop as on a coastal path.
Seasalt Cornwall – properly tested waterproofs and breton-style layers, cut for real British weather.
Joules – the queen of countryside prints, wellies and quilted jackets with a cheerful streak.
Crew Clothing – nautical, coastal casualwear that nails the smart-but-rugged weekend look.
Superdry – technical-leaning padded jackets and hoodies with a sporty, urban edge.
Timberland – the go-to for boots and rugged outerwear that genuinely lasts.
Lands’ End – dependable, well-priced down coats and fleeces in a generous size range.

Premium & performance

Barbour – the heritage waxed jacket that never dates; an investment that ages beautifully.
Sweaty Betty – performance layers and leggings with a flattering, studio-to-trail finish.

Luxury & designer

Moncler – sculptural down jackets that double as serious fashion statements.
Arc’teryx – the connoisseur’s choice for technical shells, where engineering meets minimalism.

Two off-radar names I love

Finisterre – a Cornwall-born, B-Corp brand making seriously considered, sustainable outdoor and surf-inspired pieces.
Passenger – an independent, tree-planting outdoor label with a cosy, escape-to-nature aesthetic that I keep coming back to.

How Tellar takes the guesswork out

Sizing that shifts between a roomy jacket and a snug base layer is exactly the headache Tellar was built to solve. We’re the UK’s leading sizing tool: measure once — using your bust, waist and hip, or simply an existing brand size you already trust — and your body is instantly matched to 1,500+ brands. You never have to squint at a size guide again.

Measure once, using 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 and more.
Always free, no downloads needed — it works straight in your browser.

Stop guessing your Trespass size.

Match your body to 1,500+ brands in real time — free, instant, no downloads. Find your exact fit before you buy.

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My final word? Trespass is genuinely good value and properly weatherproof — just shop it garment by garment rather than picking one size for everything. Get the jacket right for layering, keep the base layers snug, and you’ll get the best out of one of Britain’s most underrated outdoor names.