The Ultimate Guide to Gym Clothes & Perfect Fit

Whether you're buying performance wear from high-street brands or unique boutique labels, precise sizing is the foundation of comfort and confidence in your workouts. Sizing inconsistency often leads to returns, frustration, and wasted money. That’s where Tellar.co.uk steps in as the UK’s leading free sizing tool—offering real-time, data-backed fit recommendations across thousands of brands.

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 High-Street & Performance: Know Your Size

Top brands like Fabletics, Decathlon (including Domyos), and PE Nation deliver quality gymwear—but their sizing can vary dramatically across cuts and fabric types.

• Fabletics ranges are known for strong compression; their popular PowerHold® leggings can feel tight—skip guesswork by using Tellar’s Fabletics Sizing Guide to find your true size.

• At Decathlon, sub-brands like Domyos shift between EU and UK charts—explore the Decathlon Sizing Guide to decode their sizing quirks.

• PE Nation uses AU/US sizing with high-compression leggings and snug bras; their PE Nation Size Guide breaks down where to size up or down.

Tellar centralises all this data so you don’t have to juggle charts—just enter your measurements once and get personalised, live size matches for each product.

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 Designer & Boutique Labels Fitting Right

Premium and niche brands often have inconsistent sizing due to technical fabrics or boutique production runs.

• Pineapple—famed for dancewear and slim-fit leggings—run small. Tellar’s Pineapple Sizing Guide highlights how to size up for better comfort and avoid tight leotards.

• 2XU compression gear needs a performance-calibrated fit—Tellar’s 2XU Size Guide ensures your tights and sleeves feel right, not too tight or too loose.

• High-street brands with tailored cuts—like Red Herring—benefit from Tellar’s Red Herring Sizing Guide to avoid slim-fit surprises when choosing gym-to-office crossover pieces.

Each guide is linked live, meaning you can click through and access up-to-date fit advice right from the brand you’re shopping.

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 Why Tellar’s Live Sizing Matters

Tellar’s system isn’t based on static charts—it pulls live stock and size data across brands, matching it to your unique measurements. Here's what makes it essential:

1. Precision across fabrics & cuts

   Compression vs relaxed, cropped vs full length—Tellar accounts for these fit traits, so you get accurate size matches.

2. One measurement profile for everything

   Measure once, shop everywhere—with instant size matches in any brand or item.

3. Free measuring tape & tool

   Print your tape or order one free from Tellar—you’ll enter your measurements accurately, avoiding incorrect guesses.

4. Fewer returns, more confidence

   Size-related returns make up 60%+ of online orders. Tellar drastically reduces these by aligning fit before checkout.

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 Highlighted Brand-Guides: Quick Overview

(Links are live to Tellar.co.uk posts for quick access.)

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 How to Shop Smart: Tellar Workflow

1. Print or order your Tellar measuring tape.

2. Measure accurately—bust/chest, waist, hips—and optionally height or inseam.

3. Create your free Tellar profile and input your measurements just once.

4. Compare sizes live when browsing any brand or product—no need to search for confusing charts.

5. Buy with confidence, knowing items will fit well and returns are unlikely.

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 Suitable for Every Discipline

Tellar supports gym, yoga, Pilates, running, outdoor, and everyday activewear. It’s engineered for all:

• Compression gear (2XU, Domyos)

• Lightweight technical pieces (PE Nation, Pineapple)

• Lounge-to-gym styles and layering (Red Herring, Fabletics)

• Tailored visits or hybrid looks (Red Herring jackets, 2XU tights)

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 Connect with Tellar

Stay inspired and fit-informed:

• Instagram: @Tellarsizing

• Twitter/X: @TellarSizing

• Facebook: Tellar Sizing

• Pinterest: TellarSizing

Catch our latest brand guides, size tips, and real-user success stories through these channels.

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 Final Take

Buying workout clothes doesn’t have to be a guessing game. With brand-specific insights from Tellar (live links to Fabletics, Decathlon, PE Nation, Pineapple, 2XU, Red Herring) and a precision sizing system built for UK shoppers, you can shop confidently—no returns, no surprises.

Say goodbye to frustrating exchanges and hello to clothes that fit perfectly from the first wear.

Start your free profile at Tellar.co.uk, print your tape, and unlock perfect fit across your gym-luxe wardrobe today.

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Ready to revolutionise your fit?

➡️ Start with your free Tellar profile: https://tellar.co.uk

Explore these live sizing guides now:

• Fabletics

• Decathlon

• PE Nation

• Pineapple

• 2XU

• Red Herring

Shop fewer, fit better.