Costco’s Kirkland clothing solves a common problem

When you think of Costco’s Kirkland Signature brand, you probably picture the label on an assortment of grocery items. 

From olive oil and coffee to prepared meals and snacks, Kirkland Signature has built a reputation as a trusted alternative to name brands, often matching or exceeding their quality – only at a significantly lower price point. 

In fact, during Costco’s Q2 2026 earnings call, CFO Gary Millerchip said, “Kirkland Signature remains a top focus to deliver great value for our members, with KS items typically offering 15% to 20% value compared to the national brand alternative, with equal or better quality.”

But the Kirkland label extends far beyond the grocery aisles. Over the years, Costco has steadily expanded the brand into a wide range of categories, including household goods, electronics accessories, and apparel. 

What started as a practical offering – think basic T-shirts, socks, and seasonal wear – has evolved into a surprisingly strong clothing lineup that resonates with Costco’s value-focused membership base. And there’s one element of Kirkland Signature apparel that really stands out.

Kirkland clothing’s biggest advantage: size inclusivity

One of the most frustrating elements of shopping for clothing is finding the right fit. For people whose figures don’t fit a common mold, it can be even more challenging to find affordable clothing that’s also trendy. 

A big thing Costco has done right with its Kirkland Signature clothing line is maintain size inclusivity – an area where many apparel brands still fall short.

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Many Kirkland clothing items are offered in sizes ranging from XS to 3X, giving a broader spectrum of shoppers access to the same styles. This approach eliminates the all-too-common scenario where extended sizes are limited to select designs or excluded entirely. 

“The pieces I tested from Kirkland Signature were actually some of the most size-inclusive that I have ever tested,” according to New York Times Wirecutter writer Frances Sola-Santiago. 

And while she noted that a lot of sizes above XL are only available online, they’re available nonetheless.

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A smart play for Costco

Size inclusivity across Kirkland Signature apparel aligns closely with Costco’s broader business philosophy. 

The company is not trying to chase fashion trends or cater to niche markets. Rather, it’s focused on serving as many members as possible with practical, high-quality products at reasonable prices. By offering extended sizing as a standard rather than a specialty, Kirkland clothing reinforces that mission.

It also creates a competitive advantage. 

Shoppers who struggle to find well-fitting, affordable basics elsewhere are more likely to return to Costco, knowing they can rely on consistent sizing and availability, even if they do have to order their clothing online. In a retail landscape where inclusivity is often marketed but inconsistently delivered, Costco is bound to continue winning consumers over.

Of course, this ties directly into yet another strength of the Kirkland Signature brand.

By controlling its own product lines, Costco can maintain tighter oversight of quality while keeping prices competitive. This allows the company to offer products that meet or exceed expectations without the markup typically associated with national brands. 

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“With a now-established track record, putting the name Kirkland on all of Costco’s private label assortment is like putting a seal of approval on every product,” retail expert Bob Amster told RetailWire.

Ultimately, Kirkland clothing is more than just an add-on category – it’s a reflection of Costco’s broader commitment to value. By expanding inclusivity and maintaining its quality standards, the brand gives members yet another reason to keep coming back.

Maurie Backman owns shares of Costco.

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