Never check your shirt size again.

OpenTailor remembers everything you’ve worn, and how they fit — and reasons from it. So you, or an agent shopping for you, know exactly what you’re getting before it arrives.

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Join users around the world who are seeing fit-based returns nearly disappear.

Designed to work wherever you already shop

Every purchase you’ve made informs your next.

You know the feeling: the jacket that ran small, the shoes that arrived half an inch too short. Your body changes — and a size chart only ever sees a snapshot of it. What shows up at your door rarely matches the picture in your head.

OpenTailor reasons from your past purchases — the things you’ve worn, the things you’ve returned — so everything you buy next comes with a fit you can actually expect.

25%of online apparel orders are sent back by shoppers.

$8–12What the average American pays in restocking costs every time an item goes back.

15.8%of annual sales retailers lose to returns.

A memory of everything you’ve worn — kept or returned.

So you know how the thing you’re buying fits, relative to the things you’ve worn on your body.

Remember

You don’t know your measurements — you know how things you’ve worn felt. OpenTailor builds a persistent memory of those experiences: what you kept, what you returned, and how each piece actually fit.

Reason

Every new item is compared against your fit memory — longer than your favorite tee, snugger in the shoulders than the jacket you wear weekly.

Know

You see how it will fit before it arrives — and buy with certainty. As your body and taste evolve, your OpenTailor evolves with you.

GAP Heavyweight TeeConsidering size M

OpenTailor

Length2 cm longer than the red RL polo you wear most

ChestFits closest to the blue Gap hoodie you wear to the gym

SleevesClosest drop to the white Uniqlo tee you rebuy

Biceps1 cm tighter on the flex than your Pool House muscle tee

Order M — fits the way you like

Beyond clothing

Everything worn on the human body.

Glasses too narrow for your face. Rings too tight. Shoes shipped from overseas, inches short. Sizing fails everywhere — OpenTailor covers 190+ categories of wearables, across every region’s size system.

T-shirtsSneakersDenimSuitsDressesGlassesRingsWatchesCoatsBootsBrasSwimwear

HatsGlovesBeltsHeelsScarvesSunglassesBraceletsSocksHelmetsJacketsLoafersOvershirts

Built for the agentic era

Your agent can’t try things on. Now it can remember.

As agents begin to shop on our behalf, they need what humans never had: a trustworthy, evolving account of fit. OpenTailor is that context layer — your fit memory, made machine-readable, queried before anything is bought.

agent session

> buy overshirt for jake, fits like his chore coat

opentailor.fit("overshirt-04", "ot_7f3k…")
→ size: "M"
→ fit: "sits like the chore coat worn weekly;
        sleeves 1 cm longer than he keeps them"
→ returns_risk: "low"

✓ ordered — no size chart was opened

“Humans, and agents acting on their behalf, need sizing that evolves with them.”

— from Humans need better sizing, June 2026

Speak to the team.

OpenTailor is becoming the infrastructure layer for the human-wearable industry — and it starts with conversations. Tell us where you sit in it.

ShoppersGet early access →Retailers & brandsPartner with OpenTailor →Tailors & manufacturersWork with us →

Engineers, builders, the curious — write to info@opentailor.com or send a DM.