Size Recommendation for Denim Brands

Size recommendation for denim brands works best when you split the jeans question in two: waist size from a short body scan matched to your own chart, and length from clear inseam options. A denim size recommendation tool answers "which waist?", while your product page answers "which length?"

This guide shows how to set that up for a jeans store, which chart columns to use and how to handle stretch and different fits. For the wider picture across all garment types, start with the guide to AI size recommendation for fashion stores.

Why is denim harder to size than other clothing?

Jeans have two sizes in one label, waist and length, and shoppers often guess both. A T-shirt buyer picks one letter. A jeans buyer picks a waist number and an inseam, and then wonders how the cut will feel.

Three things make denim tricky:

• Labels don't match bodies. A "32" waist in one brand can measure differently from a "32" in another. Shoppers learn their size from past purchases, not from a tape measure.
• Fabric changes the fit. Rigid denim holds its shape. Stretch denim gives at the waist and thigh, so the same body may fit a smaller size.
• Cut changes the fit. Skinny, straight, relaxed and wide-leg jeans sit differently on the hips and thighs, even with the same waist number.

A good jeans size finder handles each of these, rather than hiding them behind one button.

How does a denim size recommendation work?

With ZeDaq.ai, the shopper taps Find my size on the product page, uploads one full-length photo and types their height. The scan runs on the shopper's device and estimates body measurements.

Those measurements are matched against the chart you entered for that garment type. For bottoms, the match uses waist and hips, and the larger of the two decides the size. That rule suits denim well, because a pair that fits the waist but pinches the hips is a common reason jeans don't work.

If the shopper falls between two sizes, the tool picks the roomier one. A slightly loose waist can be fixed with a belt or a simple alteration. Tight hips can't.

What should a denim size chart include?

Your chart should use body measurements, not flat garment measurements. Ask "what waist and hips does the person who fits this size have?", then enter a minimum and a maximum for each.

Here is an example chart for one fit. It is an illustration only, so check your brand's own chart and fit tests before you use any numbers.

Label	Body waist (cm)	Body hips (cm)
28	70–73	88–91
30	74–78	92–96
32	79–83	97–101
34	84–88	102–106
36	89–94	107–112

Example chart, check your brand's own chart.

Keep the ranges touching. If one size ends at 78 cm and the next starts at 80 cm, a shopper at 79 cm lands in a gap. Closing gaps is the quickest fix for odd suggestions.

How do you handle inseam and length?

The size suggestion covers the waist and hip fit. Length is a separate choice, so make it easy:

1. Offer length as its own variant, such as Short, Regular and Long, or as inseam numbers.
2. Write the inseam in the product description for each length, in both inches and centimeters.
3. Add one line of waist and inseam advice, such as "Regular suits most people of average height. Choose Long if you prefer a stacked hem."
4. Mention if you offer free hemming or a length alteration in store.

Shoppers who know their inseam will pick it. Shoppers who don't will rely on your short guidance next to the length selector.

How do you deal with stretch, rigid and different cuts?

Treat each fit that sizes differently as its own chart. The chart is where your fit knowledge lives.

• Stretch denim: If your stretch jeans fit a size smaller, set the ranges a little higher so the scan suggests the smaller label.
• Rigid denim: Keep the ranges tighter. There is less give, so the roomier pick between sizes matters more.
• Relaxed and wide-leg cuts: These usually fit at the waist but have room in the hips and thighs. Your hip ranges can be wider.
• Skinny cuts: Hips and thighs matter most. Test this chart on a few real bodies before you go live.

ZeDaq.ai gives you one chart per garment type: tops, outerwear, dresses and bottoms. If you sell a stretch skinny and a rigid straight that size very differently, use the bottoms chart for the core fit you sell most. Then add a fit note on the other product, such as "rigid fabric, size up if between sizes."

What does a good denim product page look like?

The size suggestion works best when the rest of the page backs it up. Use this checklist on each style:

• Fit name and rise in the title or first line, such as "high-rise straight".
• Fabric in plain words: "rigid cotton" or "stretch denim".
• Model details: the model's height and the size they wear.
• Inseam for each length, in inches and centimeters.
• A fit note if the style runs small or large.
• Find my size near the size selector, not hidden below the fold.

Larger sizes need extra care, because hip and thigh room varies most across bodies. The guide to size recommendation for plus-size stores covers extended ranges and chart gaps in more detail.

How do you set it up step by step?

You can set up a denim size finder in one sitting.

1. Install or embed. On Shopify, install the app from the Shopify App Store. On WooCommerce, Wix, Squarespace or a custom site, paste the script tag into your product template. The key is locked to your store's domain.
2. Enter your bottoms chart. Choose centimeters or inches and add waist and hip ranges for each label.
3. Test it. Run a few sets of measurements from your own team and check the suggestion matches what you'd say in a fitting room.
4. Write length guidance. Add inseam numbers and one line of advice for each length.
5. Check on a phone. Open a product page on mobile, run the scan and confirm the label matches your chart.

The script tag looks like this:

<script src="https://www.zedaq.ai/widget/zedaq.js" data-key="…" defer></script>

If you also sell leggings or performance wear, those fabrics stretch far more than jeans. The guide to size recommendation for activewear brands explains how to set ranges for high-stretch fabric.

What does it cost to run?

Each scan uses one measurement from your monthly allowance. The Free plan includes 3 measurements a month, which is enough to test on your own products.

Paid plans start at Micro, $14 a month, then Starter at $49, Growth at $129 and Scale at $299. Every paid plan has a 3-day free trial with no card required. Check the current plans and limits before you choose.

Does this work for denim with cultural or custom fits?

Yes, as long as your chart describes the fit you sell. Some brands combine denim with African prints, or sell jeans cut for curvier hips and a smaller waist. The chart approach still works, because you set the ranges.

Brands that mix prints, tailoring and ready-to-wear face extra sizing choices. The guide to size recommendation for African fashion brands covers mixed catalogs and made-to-measure orders.

FAQs

Does the scan recommend inseam length?

No. The suggestion covers waist and hip fit from your bottoms chart. Length is a separate choice, so list inseam for each length on the product page.

Can I enter my chart in inches?

Yes. You can enter ranges in centimeters or inches. Pick the unit your team already uses for fit tests.

What if a shopper is between two waist sizes?

The tool picks the roomier size and tells the shopper. A slightly loose waist is easier to wear or alter than tight hips.

Does the shopper need an account?

No. The shopper uploads a photo and types their height on your product page. There is no sign-up and nothing to download.