For Michelle Suter, a 63-year-classic retiree from the suburbs of St. Louis, Missouri, the most rewarding part of her health journey isn’t just the number on the scale. After losing approximately 28 pounds using the GLP-1 medication Wegovy, Suter is rediscovering the joy of a form-fitting wardrobe—something she had long since abandoned in favor of baggy clothing.
“That’s part of the excitement — to wear things that are new and fit rather than old clothes that you can tie the drawstring tighter,” Suter said. Her experience is becoming a blueprint for millions of Americans, creating a significant new tailwind for apparel retailers may benefit from a massive, medication-driven shift in consumer sizing.
As GLP-1 drugs—originally designed for diabetes—become more accessible through new pill forms and lower costs, a “closet refresh” phenomenon is emerging. Market researchers and analysts are now tracking a tangible shift in inventory demand, from intimate apparel to high-end athletics, as a growing cohort of users transitions out of plus-sized clothing.
The scale of the potential impact is substantial. According to a KFF Health Tracking Poll conducted from Oct. 27 to Nov. 2, nearly 13% of U.S. Adults—about one in eight—are currently taking a GLP-1 drug such as Ozempic or Zepbound. Projections from JPMorgan suggest that by 2030, more than 30 million Americans could be on a GLP-1 treatment, up from an estimated 10 million in 2026.
The ‘Leading Indicator’ in the Lingerie Aisle
The first signs of this retail shift aren’t appearing in t-shirts or jeans, but in the most precise category of all: bras. As intimate apparel requires a strict fit, it serves as a bellwether for the rest of the industry. Market research firm Circana reports that bra band sizes of 42+ and cup sizes of D are losing market share, while mid-range and smaller sizes—including band size 40 and B and C cups—are gaining.
Hillary Super, CEO of Victoria’s Secret, noted a roughly 3% downward swing in the bra band and underwear sizes being sold, a trend she attributed to the rise of GLP-1s. Kristen Classi-Zummo, an apparel industry advisor for Circana, noted that while other clothing categories allow for some flexibility in sizing, bras “have to fit,” making them the primary indicator of the broader trend.
This shift is now spilling over into general apparel. Circana data indicates that plus-sized clothing for women is losing market share to apparel sized 12 and under, reversing a previous trend where plus-sized categories were growing faster.
Stitch Fix and the Strategy of ‘Physical Transformation’
While many retailers are reacting to the trend, Stitch Fix has leaned into it as a core growth opportunity. CEO Matt Baer stated that the company recognized the potential of weight loss drugs early, launching specific marketing campaigns and a dedicated landing page for GLP-1 users in September 2024.
The personal styling model—where clients pay $20 for a “Fix” of hand-picked items—is particularly suited for people in flux. “As people are experiencing a rapid physical transformation, they need support,” Baer said. “They’re looking for support when it comes to looking and feeling their best as their bodies change and we’re uniquely positioned to meet them at this moment.”
The data reflects a surge in demand. Client mentions of weight loss in “Fix” request notes have tripled over the last two years, with a 75% year-over-year increase in the most recent fiscal quarter. Still, the journey isn’t linear; Baer noted that some clients pause orders until they hit a goal weight, while others request “core items” to bridge the gap between sizes.
Other retailers are experiencing more volatility. Harvey Kanter, CEO of Destination XL—a specialty big-and-tall retailer—estimated that up to 25% of his customers use GLP-1s. He described the impact as “more than expected,” noting that some customers are opting for cheaper private-label shirts over luxury brands like Ralph Lauren as they wait to see where their final weight lands.
Quantifying the ‘Closet Refresh’ Economy
From a financial perspective, the “GLP-1 effect” could inject billions into the U.S. Apparel market. Bernstein, an equity research firm, estimated in a late March report that if users drop an average of three sizes and purchase five to eight items per size, it could result in 150 million to 700 million additional apparel items purchased annually.
| Metric | Estimated Impact |
|---|---|
| Potential Additional Spending | Up to $13 Billion per year |
| Unit Volume Boost | 1% to 4% increase in U.S. Clothing sales |
| Average Item Price (Basis) | $18 (per Euromonitor) |
| User Demand | 80% of users anticipate needing new clothes |
Aneesha Sherman, lead analyst at Bernstein, suggests these figures may be conservative. Because GLP-1 users often skew toward higher income brackets, they may opt for more expensive brands rather than the $18 average. This creates a diverse opportunity across the retail spectrum:
- Value & Big-Box: Walmart, Target, and TJX (T.J. Maxx/Marshalls) benefit from shoppers seeking value while rapidly cycling through multiple sizes.
- Athletic Wear: Lululemon, Nike, and Adidas may see gains as stretchier fabrics accommodate changing bodies and users become more physically active.
- Resale Platforms: ThredUp CEO James Reinhart noted that the platform captures both sides of the transition—users selling their old plus-sized wardrobes and buying smaller waist sizes in denim.
The shift is also influencing other sectors. L’Oreal-owned La Roche-Posay has introduced creams and serums specifically tested on GLP-1 users to address sagging skin, while Starbucks has debuted protein cold foam to meet the changing dietary needs of those on appetite suppressants.
Disclaimer: This article is for informational purposes only and does not constitute medical or financial advice. Please consult a healthcare provider regarding GLP-1 medications and a certified financial advisor for investment decisions.
The next major inflection point for the industry will likely follow the wider pharmacy rollout of oral GLP-1 pills from Novo Nordisk and Eli Lilly, which are expected to lower the barrier to entry and accelerate the number of consumers entering this “transition” phase of shopping.
Do you think the “GLP-1 effect” will permanently change how brands approach sizing? Share your thoughts in the comments below.
