Are There Period Underwear Brands That Specialize in Plus Sizes?

A Sourcing Guide for Inclusive Brands: Why "Grading Up" isn't enough, and how to engineer true fit for sizes 4XL-8XL.

Introduction: Fit is Function

If you are asking, "Are there period underwear brands that specialize in plus sizes?", you have likely experienced the frustration of "lazy upsizing"—where a brand simply makes a size Small bigger without adjusting the proportions. The result? Leg openings that cut off circulation and a gusset that is dangerously narrow.

Fortunately, the industry is shifting. True inclusivity means engineering the garment for curvy bodies, not just adding fabric. Brands like Aisle, TomboyX, and Modibodi are leading the charge, offering sizes up to 5XL and 6XL.

As a manufacturer, I can tell you that making a great Size 4XL requires a completely different technical drawing than a Size S. This guide will help you understand the manufacturing science behind real inclusivity.

1. The Manufacturing Gap: "Upsized" vs. "Engineered"

Not all plus-size underwear is created equal. Here is the difference between a brand that just wants your money and a brand that wants you to be comfortable.

Manufacturer's Insight: In our factory, we use different "blocks" (base patterns) for sizes XL-8XL. We specifically adjust the Front Rise (height from crotch to waist) to ensure the underwear sits comfortably over the stomach, rather than cutting across it.

2. Top Brands Setting the Standard

If you are benchmarking, look at these leaders:

1. Aisle (Sizes up to 5XL): Famous for their "Boxer Brief" styles. This prevents inner thigh chafing ("chub rub"), a major functional need for many plus-size users.

2. Modibodi (Sizes up to 6XL): They use a scientific sizing method where their "Curvy" line is fit-tested on actual plus-size models, not just computer avatars.

3. TomboyX (Sizes up to 6XL): Their signature "Floating Gusset" is designed to accommodate wider bodies comfortably, ensuring the absorbent core doesn't shift.

   

3. Sourcing Checklist: How to Build an Inclusive Line

If you are a brand owner looking to launch a Plus Size collection, here is your Tech Pack checklist:

• A. The "Gusset Ratio": You must widen the crotch width as the size goes up. A Size 4XL woman cannot be protected by a Size S (6cm wide) gusset. It needs to be 9cm+.

• B. The "Anti-Roll" Waistband: Use a wider, stronger elastic or a Fold-Over Fabric waistband. Thin elastic will flip over under the pressure of a belly curve.

• C. Fabric Content: Specify Cotton/Spandex (95/5) or Modal/Spandex. These conform to curves better than rigid polyesters.

  

4. Why Inclusivity is Profitable

The "Plus Size" market is not a niche; in many Western countries, it is the Average Size (Size 14-16 US).

• Loyalty: Plus-size customers are historically underserved. If you give them a product that actually fits, they are incredibly loyal and have high repurchase rates.

• AOV: Because functional options are scarce, plus-size customers are often willing to buy higher-value bundles.

Conclusion: No Body Left Behind

Are there brands specializing in plus sizes? Yes. But there is still room for more.

• For Consumers: Don't settle for tight, uncomfortable underwear. Support brands like Aisle that have done the engineering work.

• For Businesses: If you want to launch a truly inclusive line, you need a manufacturer who understands Complex Grading.

Ljvogues has the expertise and the machinery to produce high-quality period underwear from XS to 8XL, ensuring every customer gets the perfect fit.

Ready to launch an Inclusive Size range?

Access Ljvogues Plus-Size Patterns

About the Author

Ocean Yang

CEO & Founder, Ljvogues

Ocean Yang is the CEO of Ljvogues, a manufacturing leader championing inclusivity in the intimate apparel industry. Ocean believes that leak-proof protection is a right, not a privilege, and works tirelessly to refine sizing algorithms that serve bodies of all shapes and sizes.

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