Expanding Your Size Range (Doing It Properly)
Extending your size range is one of the strongest differentiators available to a small brand — and one of the easiest to do badly. Grading a pattern up without fitting it produces sizes that exist on the website and fit nobody.
Quick answers
- Is extending the size range worth it?
- Yes — it's a genuine, defensible differentiator
- Biggest mistake?
- Grading a pattern up without fitting it
- Do I need new photography?
- Yes — or shoppers won't trust the offer
- Is a token XXL enough?
- No — under-stocking it is worse than not offering it
What Extending the Range Actually Requires
| Requirement | Why it's non-negotiable |
|---|---|
| Fit models at the new sizes | Grading alone won't fit |
| Revised grade rules | Bodies don't scale linearly |
| Inventory commitment | Real stock, not token units |
| Photography on those bodies | Or customers won't believe you |
| Accurate charts per size | The extremes need real numbers |
Notes
Grading up is not the same as fitting. You cannot simply apply your grade rules two sizes further and ship it. Bodies change shape, not just scale, across a size range. Without fitting on a real body at the new size, you'll produce a garment that's technically an XXL and fits like a stretched XL.
Half-committing is the worst outcome. Launching extended sizes and then stocking three units, never photographing them, and quietly dropping them next season is worse than never starting. You'll have told a group of customers you're for them, then withdrawn it — and they'll remember.
Photograph the clothes on the bodies you're selling to. If your extended sizes are only ever shown on a straight-size model, shoppers in those sizes cannot tell how the garment will look and won't risk it. The photography isn't a marketing nicety here; it's the proof that the size is real.
The charts matter most at the extremes. Shoppers at the ends of a size range have been failed most often and are the most cautious. Precise garment measurements for those sizes — not extrapolated numbers — are what earn the order.
FAQs
How do I add extended sizes to my clothing brand?
Fit-test real garments on fit models at the new sizes rather than just grading the pattern up, revise your grade rules (bodies don't scale linearly), commit real inventory, photograph the clothes on those bodies, and publish accurate measurements for each new size.
Is it enough to just grade my pattern up?
No. Grading extends measurements mathematically, but bodies change shape across a size range, not just scale. A garment graded up without being fitted at that size will technically be an XXL and fit like a stretched XL — which is how brands earn bad reviews.
Why do brands fail at extended sizing?
They half-commit: a few token units, no dedicated fit work, no photography on those bodies, and quiet withdrawal a season later. That's worse than never launching, because you told a group of customers you were for them and then took it back.
Need this on your store?
Tailor Size Guide ships pre-built size charts for Shopify.