How to Find Your Perfect Fit at Alo Yoga

By Ella Blake | Tellar Fashion Hub

Alo Yoga runs on US sizing — which means as a UK shopper, you'll need to go up roughly two sizes from your American label. A US Small is a UK 8–10, a US Medium is a UK 10–12, and so on. The good news? Once you know this, Alo generally fits beautifully. The tricky part is that the fit rules genuinely vary by garment — and getting it wrong with a £120 pair of leggings is not a fun afternoon.

I'll be honest: Alo Yoga was one of those brands I lusted after on Instagram for ages before actually committing to a purchase. The aesthetic is just so good — that clean, minimal, "I woke up like this and also do yoga" energy that looks effortless in real life too. But when I finally ordered my first pair of Airbrush leggings, I nearly made the classic mistake of ordering my UK size in the US system. Very nearly a size 6 pair of leggings. We don't need to talk about what that would have looked like.

So — let me walk you through exactly how Alo Yoga sizing works, garment by garment, so you can shop with confidence.

The Alo Yoga Size Conversion Guide

Alo uses US sizing throughout, with a range from XXS to XL. Here's your full UK conversion table:

Alo LabelUS SizeUK SizeBust (inches)Waist (inches)Hips (inches)XXS04–630–32"23–24.5"32.5–34"XS0–26–832–34"25–26.5"34.5–36"S4–68–1034–36"27–28.5"36.5–38"M8–1010–1236–38"29–30.5"38.5–40"L12–1412–1638–40"31–33"40.5–42"XL16–1816–1840–42"33–35"42.5–44"

💡 Important note on L and XL: Alo's 4-way stretch fabrics are engineered to go further than most brands. Their Large can comfortably fit up to a UK 14, and XL up to a UK 18 — a genuine difference from standard activewear sizing.

Does Alo Yoga Run True to Size? The Honest Breakdown

The overall answer is yes — but it depends enormously on which piece you're buying. Here's how each category plays out:

Leggings: This is where it gets nuanced. The iconic Airbrush leggings run slightly snug — they're a high-compression fabric designed to sculpt, so if you're between sizes, go up. The Airlift style is more forgiving and fits true to size across the board. If you're a UK 10 who sits squarely in a Medium, you'll be fine. If you're a UK 10 edging toward a 12 in the hip, take the Large and you'll thank yourself later.
Sports bras: True to size for most body types, but if you're a D cup or above, size up. Alo bras are designed to look stunning — and they do — but the brand leans toward aesthetic over heavy support. For larger busts, the Lavish Bra and Lush Bra offer more coverage. Check your bust measurement against the chart above rather than just going by your usual letter size.
Tops and tanks: These are the easiest. Alo tops generally fit true to size and have enough stretch to be forgiving. Crop styles sit higher on the waist than you might expect — that's intentional, but worth knowing if you prefer more coverage.
Hoodies and sweatshirts: Alo loungewear is intentionally oversized and cosy. If you want the relaxed, drapey look — size as normal. If you prefer something more fitted, size down. I have the Accolade hoodie in my usual size and it's perfect for that "wearing my boyfriend's jumper" vibe, except actually designed for women.
Shorts: True to size, but check the inseam length if you're between heights. Alo shorts are cut for a longer leg and some styles have a higher waistband than you'd expect from a standard active short.

The Fabric Makes All the Difference

One thing that makes Alo genuinely different — and genuinely worth the price tag — is that the fabrics are engineered to perform. This also affects how they fit. Here's a quick guide:

Airbrush: High compression, sculpting, second-skin feel. The most popular fabric. Runs snug — size up if between sizes.
Airlift: Lighter compression, more relaxed feel. True to size. Great for yoga and Pilates.
Alosoft: Ultra-soft, minimal compression. Slightly more generous in fit — one of the more forgiving fabrics in the range.
Accolade: Their signature loungewear fabric — plush, structured. Fits as labelled.

My Honest Take on the Fit After Wearing Alo for a Year

Once you know the system, Alo genuinely delivers. I wear a UK 10 throughout most brands and I'm a consistent Medium in Alo — leggings, bras, tops, all of it. The Airbrush leggings in particular are some of the most flattering pieces I own; the compression is firm but not uncomfortable and they hold their shape wash after wash in a way that a lot of activewear frankly doesn't.

My one consistent advice? Measure your hips before buying leggings. The waist might feel fine, but a tighter hip is where most people run into trouble — and a return on activewear is always slightly grim. Two minutes with a tape measure is the most useful thing you can do before you shop.

Where Else to Shop for Premium Activewear

Alo is brilliant, but it's also an investment. Here's where I'd look across the full price range for pieces that sit alongside it beautifully:

Sweaty Betty — The British activewear brand that, honestly, I reach for almost as often as Alo. Their Power leggings are exceptional and they size in UK from 6–22, which makes life considerably easier for UK shoppers. Runs true to UK size.
Lululemon — Alo's closest competitor in terms of quality and aesthetic. Lululemon uses US sizing too (same conversion applies), and their Align leggings are almost as cult-beloved as Alo's Airbrush. If you've cracked your Lululemon size, your Alo size will be identical.
Gymshark — For when you want genuinely great quality at a considerably lower price point. Gymshark runs small — size up here — and their Vital seamless range is a brilliant dupe for that sculpted Alo look.
ASOS — For filling in the basics around your Alo hero pieces. ASOS own-brand activewear has vastly improved and they stock an enormous range of third-party active brands too. UK sizing throughout, no conversion needed.
H&M — Their Move range is a hidden gem for budget-friendly active basics. The quality isn't Alo, obviously, but for vest tops and layering pieces? Genuinely solid. Runs true to UK size.
Abercrombie & Fitch — Their YPB (Your Personal Best) activewear line has quietly become one of the best mid-range options on the market. The Active Seamless leggings in particular have a great sculpting fit. US sizing — same conversion as Alo applies.
Zara — Underrated for athleisure. Their seamless knit co-ords are a brilliant way to get the Alo aesthetic at a fraction of the price, and they now stock a solid gym-to-street range. Runs slightly small — size up one.

On the independent side, two brands I've been recommending a lot lately:

Varley — A London-born premium activewear brand that's quietly giving Alo a run for its money. Their leggings are exceptional — high waisted, great compression, and the fabric is incredibly soft. UK-friendly sizing and a more curated range that feels genuinely editorial. Worth every penny.
PE Nation — Australian brand, massive following in the UK, and for good reason. Bold colours, strong prints, serious performance credentials. Their fit is consistent and they have a great extended size range. If you love Alo's confidence but want something with a bit more visual punch, PE Nation is the one.

Stop Guessing Your Size — Use Tellar

🏃 Get Your Exact Alo Yoga Size in Seconds — Free

US sizing conversions, fabric-specific fits, bra sizing in letters rather than numbers — Alo Yoga has a lot of variables. This is exactly what Tellar.co.uk is built for. Tellar is the UK's leading free sizing tool: you input your measurements once and it instantly gives you your correct size across 1,500+ brands — Alo, Lululemon, Sweaty Betty, and everything else in your wardrobe.

Here's how it works:

Measure your bust, waist and hips — takes about two minutes
Use the Store Size Lookup tool to get your precise size at any brand, instantly
No downloads, no subscription, no faff — completely free in your browser

And once you're there, don't miss the Tellar Fashion Hub — hundreds of honest, independent style guides written by real stylists. No adverts, no sponsored content, no brand deals. Start with The Ultimate Clothing Sizing Guide, or if you're building a full active wardrobe, browse our Ultimate Guide to Jackets for the perfect layer over your Alo sets. And if you're shopping for more than just activewear, our Ultimate Guide to Dresses is a great place to start.

The Final Word on Alo Yoga Sizing

Alo Yoga is one of those brands that rewards a bit of homework upfront. Get your size right and you'll have some of the most flattering, durable activewear in your wardrobe. Get it wrong and you're dealing with a return on compression leggings — which is nobody's idea of a good time. Use the table above, measure your hips before buying leggings, and when you're in doubt between sizes, go up. The 4-way stretch fabric will hold you; you won't lose that sculpted fit. And if you want all of this done for you automatically, across every brand you shop — Tellar has you covered.