You ordered too many L’s again.
Fashion brands lose up to 20% of monthly profit from poor size distribution. Sizo is an optimization system that uses math and statistics on your store and product data to recommend stock levels and optimize your next order — so you stop guessing and start selling through.
Every restock is a
bet.
Most brands are losing it.
Brands can forfeit up to 20% of monthly profits due to poor size distribution.
In 2023, the fashion industry produced 2.5-5B items of excess stock, valued at $70–$140 billion in unsold inventory.
76% of shoppers say stockouts damage brand perception — and 55% won’t come back after it happens twice.
Most shops never get their size ratio curve right — they’re guessing from intuition instead of measuring from their own sales. Without a tool built for that job, they’re stuck between gut feeling and a generic spreadsheet. The result is the same: mis-sized buys, stockouts on what would sell, and wasted inventory everywhere else.
Order the
right sizes.
Every time.
After a product launches, Sizo tracks every sale and return by size. It calculates your actual demand curve — say, XS:S:M:L:XL = 4:8:5:2:1 — and when it’s time to restock, it tells you exactly what ratio to order. Based on data, not instinct.
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Real demand by size
Sizo separates true demand from noise. If a size sold out early, it accounts for stockout periods so your ratio reflects what customers wanted, not what was available.
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Confidence scoring
If a size only moved 12 units, Sizo flags it. You’ll know when to trust the number and when to apply your own judgment. No false precision.
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Trend shifts over time
Is M growing? Is XL slowing? Sizo shows demand movement over 30, 60, and 90 days so your restock reflects this season’s customer.
“We used to default to a 1-2-2-1 ratio on every restock. Sizo showed us our actual curve was closer to 1-3-2-1 on our core tees. That shift alone recovered thousands in lost sales on the next PO.”
Launching
something new?
Don’t guess the opening order.
Right now, if a product has never sold before, brands have nothing to go on. They default to equal splits across sizes, or copy a vaguely similar product from two seasons ago. Both approaches leave money on the table before the product even ships.
Sizo will analyze the size curves of your existing catalog — products with similar cut, category, and customer base — and use those patterns to generate a recommended opening order ratio for new launches. You’ll go into your first PO with a data-backed starting point instead of a coin flip.
Only about 60% of fashion inventory sells at full price — the remaining 40% requires discounting. — Avantex
A smarter opening order means more units moving at margin, and less dead stock hitting clearance before it finds its audience.
Not just which
sizes —
how many units, total.
Getting the ratio right is half the battle. The other half is knowing how many units to order in the first place. Order too few and you stock out in week three. Order too many and you’re paying warehouse costs on dead inventory through next season.
Sizo will combine your sales velocity, lead time from your supplier, and historical sell-through rate to recommend a total quantity — not just a ratio. You’ll be able to input your budget or unit target and see a projection: which sizes will stock out first, when, and by how much.
“The sales simulator let us visualize our buy before committing $50k to the factory. It paid for itself on the first order.”
From connection to action
Connect your store
1-click Shopify integration. Read-only access to sales data. No dev work, no exports. Done in under a minute.
Sizo reads your data
Syncs order history by size, detects stockouts, filters noise, and builds demand curves — automatically in the background.
Use the pillars you need
You might rely on one pillar or all three — Restock intelligence (ratios & confidence), Launch intelligence (opening orders for new drops), or Quantity intelligence (how many units, total). Review each in Sizo, then export a PDF or CSV when you’re ready to brief your supplier.
Brands running on Sizo
“We had a wholesale order that wiped out our XS stock early in the season. That completely skewed our size data. Sizo’s confidence score caught it — saved us from building next season’s order on a fluke.”
“No more dead inventory sitting in XXL. We used to assume our customers ran large. They don’t. Sizo showed us the actual split and we’ve never had an end-of-season clearance problem since.”
“The PDF export goes straight to our factory. We used to spend half a day building that spreadsheet by hand. Now it’s one click.”
“We had a wholesale order that wiped out our XS stock early in the season. That completely skewed our size data. Sizo’s confidence score caught it — saved us from building next season’s order on a fluke.”
“No more dead inventory sitting in XXL. We used to assume our customers ran large. They don’t. Sizo showed us the actual split and we’ve never had an end-of-season clearance problem since.”
“The PDF export goes straight to our factory. We used to spend half a day building that spreadsheet by hand. Now it’s one click.”
Invite only at the moment
Sizo is invite-only
Access is by invitation — tell us about your shop and we’ll connect you with the team.
Want to optimize inventory with data-backed size curves? Reach out and we’ll add you to the waitlist.
Stop guessing.
Start selling through.
Sizo is invite-only right now. Tell us about your shop — when we onboard you, you’ll connect your store and see your real size curve so every restock is built on data, not guesswork.