What order data across dozens of apparel and clothing shops reveals about product concentration, discounting, and why fewer choices convert better.
Picture a customer opening an email from a shop they bought from three months ago. The subject line says “New Arrivals.” They have seen that line a dozen times from a dozen brands, and they do not open it. Now picture the same customer getting a different email instead: “5 products people are buying right now.” That is a smaller, more specific promise, and it works better, for reasons that have nothing to do with discount codes.
The direct answer: yes, bestseller email marketing increases repeat purchases, because showing customers what is actually selling right now solves a real problem (too many choices, too little signal about which one is worth trusting) rather than manufacturing urgency out of nothing. It works whether or not a discount is attached. It is not, however, a replacement for a sound pricing strategy, and the database backs that distinction up clearly. Both points matter, and both are covered below.
Key Takeaways
- Highlighting a small number of currently popular products reduces decision friction more effectively than showing a full catalog, a pattern confirmed by one of the most replicated findings in consumer psychology.
- Across a sample of 85 apparel and clothing shops analyzed over the past 12 months, the 10 best-selling products accounted for an average of 18% of total item purchases. That is a real concentration effect worth building content around.
- Personalized, relevance-driven communication, the category “what’s trending” emails fall into, has been shown by McKinsey to lift revenue 5 to 15%. That gain is independent of discounting.
- The database also shows first orders placed with a discount had a notably higher repeat purchase rate than full-price first orders, a detail that complicates any claim that content alone can replace pricing strategy.
- The winning approach pairs real, verifiable product velocity data with a smart pricing plan. Neither one on its own tells the full story.
Why Do Most Retention Emails Fall Flat?
Most eCommerce email calendars are built around what the brand wants to sell, not what the customer wants to know. New arrivals. Seasonal pushes. A discount code timed to a slow week. All of it is planned months out, based on inventory targets. It has little to do with what is actually happening in the store right now.
The result is an inbox full of email that reads like advertising, because it is advertising. Customers get good at ignoring it. Open rates slide. The brand responds by discounting harder. That trains the list to wait for a sale instead of buying at full price. That habit is its own kind of expensive. It is the same pattern we see whenever we run a paid media audit for an eCommerce account. The accounts stuck on a rigid promotional calendar are almost always the same ones. They are the ones asking why their return customers have gone quiet.
None of this is a new problem, and none of it has a lazy fix. Every eCommerce brand runs this exact loop. The way out is not a bigger discount or a cleverer subject line. It is showing customers something true and specific that they cannot get anywhere else. That means showing what is actually selling well in this store, this week.
What Does the Research Say About Bestseller Email Marketing?
Four separate sources point in the same direction here. It is worth being precise about what each one does and does not prove.
The Psychology: Choice and Social Proof
The first is a well known study in consumer psychology. In 2000, researchers Sheena Iyengar and Mark Lepper set up jam tasting displays in a grocery store. They alternated between a large display of 24 flavors and a small display of six. The large display drew more browsers. The small display converted far better. Roughly 30% of people who stopped at the six-jam table bought a jar. Only about 3% did at the 24-jam table. More options generated more looking and less buying. The mechanism is decision fatigue. When everything looks equally plausible, people are more likely to walk away. Buying nothing at all feels safer than picking wrong.
The second is the social proof principle. It is a well established idea in consumer psychology, popularized by psychologist Robert Cialdini. People look to the behavior of others to decide what is safe or worthwhile. This is especially true when those others are people similar to them. A bestseller list is social proof in its plainest form. It tells a shopper, correctly, that other people already made this decision. They were satisfied enough not to return the product.
The Numbers: Personalization and Product Concentration
The third is McKinsey’s research on personalization at scale. Companies that get relevance-driven marketing right see revenue increases of 5 to 15%. They also see 10 to 30% gains in marketing spend efficiency. Most of that gain comes from targeted product recommendations and triggered communications, not blanket promotions. Telling someone “here is what is actually happening” is a form of relevance. Telling everyone the same “New Arrivals” message is not.
The fourth comes from AdScale’s own database, the same one behind our eCommerce ROAS benchmarks work. We looked across 85 apparel and clothing shops with meaningful order volume over the trailing 12 months. In each shop, the 10 best-selling products accounted for an average of 18% of total item purchases. Most of these catalogs run into the hundreds of SKUs. A small slice of the catalog reliably does an outsized share of the work. That is not a reason to stop stocking variety. It is a reason to stop pretending every product deserves equal airtime in a marketing email.
Is This Just Manufactured Urgency?
The instinct is to treat “what’s trending” content as a scarcity trick, a softer version of a countdown timer. That is the wrong frame, and it is worth naming the right one directly.
Call it the visibility gap. A store’s best-selling products are already popular. The customer scrolling a homepage or a category page usually cannot tell which products are the best sellers. That is the same browsing behavior we track in our ad timing analysis. The email is not creating urgency out of thin air. It is closing a gap between what is true inside the business and what the customer can see from the outside. Inside, five products move fastest. From the outside, it just looks like a wall of near-identical listings. Closing that gap is useful information, not a manipulation tactic, provided the numbers behind it are real.
That is also where the database introduced an honest complication. AdScale checked whether a discount on someone’s very first order changed the odds they came back. Discounted first orders returned at a notably higher rate than full-price ones. That does not mean the visibility strategy is wrong. It more likely means price-motivated shoppers are already inclined to be repeat shoppers. That makes the two groups hard to compare directly. But it does mean nobody should present “highlight your bestsellers” as a way to avoid ever discounting again. The database does not support that claim. A good retention strategy uses both levers instead of picking one and ignoring the other.
How Do You Build a Bestseller Email Marketing Strategy?
Good bestseller email marketing is boring in the best way. Pull real numbers from your own store, feature a small number of products, and repeat it on a schedule.
This does not require new software. It requires treating your own order history as a live feed instead of a report you check once a quarter. Every merchant we work with already has this data sitting in their order history. The only shift is building a habit of looking at it weekly instead of only at reporting time. That habit is usually the harder part to build than the email template itself.
Practical Steps for Bestseller Email Marketing
- Pull the last 7 to 14 days of order data and rank products by unit velocity. Use your platform’s own order export or your analytics dashboard. Do not estimate. If a product cannot be traced to real order counts, it does not go in the email.
- Narrow the list to 5 products, not 15. The jam study result holds here: a shorter, confident list outperforms a long one that tries to cover every category.
- Write the subject line as a fact, not a pitch. “5 products our customers keep reordering” beats “New Arrivals Are Here.” It works because the claim is specific and verifiable, not because it is louder.
- Keep the copy plain. State what the product is and why it is popular in one sentence (best reviewed, most reordered, sold out and restocked). Skip invented countdown numbers or manufactured scarcity language you cannot back up from your own records.
- Test a full-price version against a small loyalty-only incentive. The database showed discounts and return rate are connected. Do not assume either pricing approach wins by default for your list. Run both for a full cycle before deciding.
- Automate the pull, not the judgment. A saved report or a simple dashboard view that refreshes weekly removes the manual work. A person should still glance at the list before it goes out. Automation will occasionally surface an odd result.
- Track repeat purchase rate over a full quarter, not a single send. One email will not move the number. A consistent weekly signal, measured against your baseline repeat rate, will.
Frequently Asked Questions About Bestseller Email Marketing
Yes. The mechanism is relevance and reduced decision friction, not price. The database shows discounted first orders return at a higher rate than full-price ones. Pricing still matters, but the bestseller format itself does not require a discount to perform.
Five is a reasonable starting point. The research on choice overload consistently shows that smaller, curated selections convert better than long lists. This holds true even when the long list draws more initial attention. If a store has strong seasonal variation, it is worth testing four versus six. See which count holds up best for that specific list.
Not inherently. The content highlights popularity, not price. It does not train customers to wait for a markdown the way a recurring discount calendar does. Monitor average order value after launch to confirm the pattern holds for your list specifically.
Weekly is a common starting cadence, matched to how often product velocity actually shifts. Slower-moving categories, like furniture or big-ticket items, may only need a biweekly or monthly version. Their bestseller list will not change fast enough week to week to justify sending more often than that.
Smaller catalogs can use the same logic at a smaller scale. Highlight the top 2 to 3 performers instead of 5. Or extend the lookback window from 14 days to 60, so enough order volume accumulates to rank products meaningfully. The point is showing real, verifiable popularity signals, not hitting a specific product count.
So What’s the Bottom Line?
Every eCommerce brand already has this data. It sits in the order history, unused, while the marketing calendar gets planned around guesses made three months in advance. The fix is not a bigger discount or a louder subject line. It is showing customers something true: this is what people like them are actually buying right now. Do that consistently, keep it verifiable, and pair it with a pricing strategy that holds up on its own. The repeat purchase rate takes care of itself.
Keep Learning
Apparel Ad Copy That Converts: What 30 High-Performing Words Reveal – a related look at what actually drives clicks in apparel marketing.
Clothing Industry Ad Benchmarks: What 100M+ eCommerce Orders Reveal About Google vs. Meta – how AdScale merchants’ ROAS compares by vertical, referenced twice in the body above.
What Is the Best Time of Day to Run eCommerce Ads? – order-data-verified timing patterns for ad delivery, referenced in the Reframe section above.




,