For years, fashion retailers were moving in one direction. More sizes, bigger ranges, more choice for plus-size shoppers. Now, that appears to be reversing, and the rise of GLP-1 weight loss drugs could be one of the reasons why.
Retailers including H&M and Mango are cutting back on the number of larger sizes they offer, just as the popularity of drugs such as Ozempic, Wegovy and Mounjaro continues to grow.
The result is a strange contradiction. People taking GLP-1s are spending more on clothes while retailers are offering fewer clothes in larger sizes.
So, what is happening to the plus-size market?
The plus-size retreat is happening quickly
In 2023, retailer H&M expanded its women’s sizing up to 4XL, following a partnership with model and body-inclusivity campaigner Tess Holliday. Just three years later, 3XL and 4XL have disappeared from its new womenswear dress inventory.
Research from retail analytics company Edited found that those sizes represented around 2% of H&M’s new women’s dress inventory between January and May 2025. In the same period of 2026, they were gone.
Mango has made an even more dramatic reduction. The proportion of its new dresses available in sizes 16 to 20 fell from 6.6% in spring/summer 2025 to just 0.5% in 2026. Anthropologie has also reduced its plus-size offering.
This isn’t just a few missing sizes on a website, it represents a much wider change in the retail industry. After years of talking about size inclusivity, some retailers are now quietly moving in the opposite direction.
Is GLP-1 the reason?
It’s difficult to say that GLP-1s are the reason. Retailers make decisions based on sales, margins, stock levels and demand, and some have said that larger sizes simply aren’t selling strongly enough.
But the timing is difficult to ignore.
PwC’s 2026 research found that 21% of US households now include someone using a GLP-1 medication, more than double the 9% recorded in January 2025. And the effect on clothing is significant.
73% of GLP-1 users report a meaningful change in clothing size. That means millions of consumers are potentially moving through different clothing sizes at a much faster rate than retailers have traditionally had to deal with.
GLP-1 users are spending more on clothes
You might expect weight loss to mean less spending on clothing. Actually, PwC found the opposite.
Overall apparel spending among GLP-1 users was 9.9% higher after six to eight months on the medication. PwC also found that 26% of GLP-1 users say they are spending more on clothing overall.
Circana’s research tells a similar story. 80% of GLP-1 users expect to need new clothing because their size is changing, while 55% of active users have already bought new clothing or footwear.
So there is clearly money being spent. The question is:
Who is getting that money?
The problem with shrinking the size range
If a customer loses weight and needs a new wardrobe, there is potentially a very valuable customer journey happening.
They may need new jeans.
New dresses.
New work clothes.
New occasionwear.
New underwear.
And then, as their size changes again, they may need to repeat the process. That sounds like a very good customer for a clothing retailer.
But if retailers respond by simply removing the larger sizes, they risk losing customers during the very period when they could be spending more.
And there’s another problem. Not everyone is taking a GLP-1. The Guardian reported that around 66% of US women still wear a size 14 or above, despite the changes taking place in the fashion industry. That is an enormous customer base. It is difficult to describe a market as disappearing when tens of millions of potential customers are still there.
The second-hand market tells a different story
While some mainstream retailers are reducing their plus-size ranges, demand for larger clothing hasn’t necessarily disappeared. ThredUp reported that purchases of large, XL and plus-size women’s clothing increased 17.4% in 2026, more than twice the growth rate for small and medium sizes.
Its data doesn’t establish that this is caused by GLP-1s, but it does suggest something important:
The demand hasn’t simply vanished. Some of it may be moving elsewhere.
That could be a warning for mainstream retailers. If customers can’t find what they want from you, they don’t necessarily stop shopping. They find another retailer.
We've seen a similar question in fitness
This isn’t the first time we’ve looked at GLP-1s through the lens of changing consumer behaviour. Earlier this year, we looked at whether weight-loss drugs could quietly affect beginner numbers in Brazilian Jiu-Jitsu.
The question was whether losing weight through medication might remove one of the reasons someone would previously have joined a gym.
But the bigger point was that GLP-1s don’t necessarily eliminate demand, they can change the reason someone buys.
The same thing appears to be happening in fashion. A customer who loses weight may buy differently, but that doesn’t mean they stop being a customer.
In fact, the PwC figures suggest some are spending more.
Are retailers looking at the wrong data?
This is where the story becomes particularly interesting from an ecommerce perspective. Retailers have to make difficult decisions about inventory. If the data says certain sizes aren’t selling, reducing stock makes commercial sense. But there is a danger in looking at the data too narrowly.
What if customers aren’t buying because the products aren’t available?
What if they have stopped searching for a retailer’s website because they already know their size isn’t stocked?
What if they have moved to another retailer?
What if demand is growing somewhere else, such as resale?
And what if the change in customer behaviour is happening faster than the retailer’s historic sales data can show?
These are not simply merchandising questions; they are customer data and marketing questions.
The opportunity may be in spotting the change sooner
For ecommerce retailers, this is where search and sales data become particularly valuable.
You can look at:
- What sizes customers are searching for
- Which products are gaining demand
- Which sizes are converting
- Which products are being abandoned
- Where customers are spending
- What they are buying instead
- Which products are generating profitable paid traffic
The key isn’t necessarily predicting what the customer will do next, it’s spotting when what they are doing starts to change.
Because by the time a retailer sees a major shift in its annual sales figures, customers may already have moved somewhere else.
What does this mean for retailers?
The rapid contraction of plus-size fashion could ultimately prove to be a mistake for some retailers.
GLP-1s may be changing the size curve, they may be reducing demand for some larger sizes. But the evidence doesn’t suggest that plus-size consumers have suddenly stopped spending.
In some cases, the opposite appears to be happening. The market is changing, that doesn’t necessarily mean the market is disappearing. For retailers, the challenge is understanding the difference.
How Dream Agility can help
At Dream Agility, we work with ecommerce and in-house marketing teams to understand what is happening underneath their paid search and ecommerce performance.
Tools such as Signal IQ can identify opportunities and wasted spend across Google Ads, while we also help teams make better decisions around products, feeds and performance.
The GLP-1 effect is a good example of why that matters. Retailers don’t necessarily need to know exactly what customers will buy six months from now. They need to be able to see when customer behaviour starts changing and respond quickly.
Get in touch with our team today because the next big retail opportunity might not be a new product. It might be a customer segment that everyone else has decided is disappearing. The racks may be getting smaller, the shoppers aren’t necessarily going anywhere.
