Introducing the Attirel Size Guide Library

Every size label is a small act of translation: from your body, to a measurement, to a number that means something different at every store in the mall. Most of us handle that translation by guessing, and the guessing shows: closets with three "mediums" in three different actual sizes, and a steady rhythm of returns.

Today we're shipping something we've wanted to exist for a long time: a complete, free sizing reference library. No email gates, no ten-paragraph preambles. Just direct answers to the questions people actually type into search bars at 11pm with a full cart.

Eight brands, honestly assessed

The heart of the library is a set of brand fit guides. Each one opens with a straight verdict (runs small, runs large, true to size), then backs it up with how the brand behaves category by category, standard international conversions, and the questions shoppers ask most:

• Uniqlo: the slim Japanese cut, explained
• Levi's: stretch vs. rigid, and when to size up
• Adidas: why so many people size down in Originals
• Gap & Old Navy: American vanity sizing at work
• Shein: navigating famously inconsistent sizing
• Lululemon: compression fit and the numeric system
• Mango: the slim European block, decoded
• ASOS: one true-to-size house brand, 850+ wildcards

Three references you'll keep coming back to

Around the brand guides sit three evergreen references. The international size conversion charts translate between US, UK, EU, AU, and JP systems for clothing and shoes. The bra size guide demystifies band math, cup letters, and sister sizes, with a worked example instead of hand-waving. And the jeans inseam & length guide finally answers what those petite, regular, and tall labels mean in actual inches.

Why static guides, when we build a fit app?

Because the two solve different halves of the problem. A guide can tell you that Uniqlo tends to run a size small or that Adidas Originals run large — the brand-level pattern. What it can't know is you: your measurements, your fit preferences, the difference between how you want a tee and a trucker jacket to sit. That's the half the Attirel app handles, matching your exact measurements against specific garments across 100+ brands.

Start with the guides. When you're ready for answers about your own wardrobe, the app is the interactive companion. And if you're not sure of your measurements in the first place, our how-to-measure guide takes ten minutes and a soft tape measure.

The library grows from here: more brands, more categories. If there's a brand whose sizing keeps burning you, we'd like to hear about it.