Understanding P Size Bras: Insight into Rare Bra Size

Written by Carmen Rodriguez

What Is a P Cup Size?

Understanding P Size Bras: Insight into Rare Bra Size. When it comes to bras, most people are familiar with cup sizes ranging from A to D or maybe DD. But breast sizes are highly diverse, and lingerie brands have responded by extending their size ranges. P cup bras fall into this extended sizing category, serving individuals with very full busts who need both specialized support and precise fit.

While not commonly found in mainstream stores, P cup bras are vital for people whose bust volume exceeds more conventional cup sizes. This article explains the fit, structure, and support considerations required for P cup bras, and offers expert guidance for finding and wearing them confidently.

Understanding the Cup-to-Band Ratio

It’s important to understand that bra sizing is relative—a P cup doesn't represent a fixed volume. Instead, the volume of a cup changes based on the band size. For example:

A 32P will have less cup volume than a 38P, even though the cup letter is the same.

This system is called “sister sizing.” The same cup volume can be represented by different cup letters depending on the band. That's why accurate measurements and professional fittings are essential when navigating extended sizes like P.

Who Needs a P Cup Bra?

Individuals with a very large bust in proportion to their ribcage may require a P cup bra. Common challenges faced by those who wear this size include:

Finding sufficient support to prevent back, shoulder, and neck pain
Avoiding spillage, quad-boob, or overflow from too-small cups
Locating bras with strong materials that don’t stretch out quickly
Achieving proper lift and shape without sacrificing comfort

People who have undergone hormonal changes, pregnancy, weight fluctuations, or genetic predispositions to larger breast tissue may find themselves in P cup territory.

Features to Look for in a P Size Bra

Bras in this size range must be engineered for maximum support and reinforced stability. Look for the following features:

1. Wide, Reinforced Straps

To evenly distribute weight and reduce shoulder strain.

2. Full-Coverage Cups

Encapsulate the entire breast for comfort and containment.

3. Multi-Part Cup Construction

Cut-and-sew cups (rather than molded ones) offer better structure.

4. Firm Underband Support

A snug, strong band is crucial—it provides 80–90% of the support in any bra.

5. Side Support Panels and Boning

Help control forward projection and underarm spillage.

6. High Center Gore

Stabilizes the bra at the front and helps separate the breasts.

Where to Shop for P Size Bras

Since P size bras are niche products, specialty retailers are usually the best source. Some trusted brands and boutiques include:

Elomi – Specializes in full-bust and plus-size lingerie
Bravissimo – UK-based brand offering an extensive range of cup sizes
Ewa Michalak – Polish brand known for precision in large-cup bras
Curvy Kate – Fun, fashion-forward bras for fuller busts
PrimaDonna – Offers luxury lingerie in extended sizes with superior craftsmanship

Many online retailers also allow for virtual fittings and free returns, which is especially helpful for hard-to-find sizes.

Expert Tips for Wearing a P Cup Bra

Get fitted professionally at least once a year. Breast size can change with time.
Rotate between several bras to avoid wearing out the elastic too quickly.
Wash bras by hand or in a lingerie bag with mild detergent to preserve structure.
Don’t settle for discomfort. A properly fitted P cup bra should lift, support, and shape without pain.
Consider specialty lingerie for activities like exercise, nursing, or sleep to maintain proper support in every context.

Final Thoughts: Support Without Compromise

Finding a P size bra can be challenging, but it's entirely possible—and empowering—with the right knowledge and resources. No one should have to sacrifice comfort, style, or self-confidence because of a limited size range. With expert construction and access to extended-size specialists, you can find bras that fit beautifully, feel supportive, and enhance your everyday life.