How to Choose Breast Forms: A Transfeminine Guide

If you’re wondering how to choose breast forms, you’re not alone. It’s one of the most common early questions for transfeminine people—and one of the most confusing. There are so many types, sizes, shapes, materials, and ways to wear them that it can feel totally overwhelming.

This post is here to walk through it all, step by step. From realistic silicone forms to budget-friendly DIY options, we’ll talk about how to choose what works for your body, your goals, and your comfort level.

I’m still figuring this out myself, so everything here is part research, part lived experience. Let’s explore together.

How to Choose Breast Forms: The Main Types

Silicone Breast Forms

These are the most common and realistic option. Silicone forms come in all kinds of shapes (teardrop, triangle, oval, asymmetrical) and feel soft and weighted, which helps mimic the bounce and drag of natural breast tissue. They can be worn with pocket bras or stuck directly to the skin with adhesive.

Best for: Realism, daily wear, layering under clothes

What to know: They can get heavy, especially in hot weather, and are usually more expensive. But they look and feel amazing if you want that extra realism.

Foam Breast Forms

Foam forms are lightweight, soft, and breathable. They’re not nearly as realistic in appearance, but they’re comfortable and great for daily wear when you don’t want the weight or heat of silicone.

Best for: Lounging, casual wear, hot weather, beginners

What to know: These are perfect if you want a lighter feel or are still experimenting. Great option for building confidence without spending a lot.

Cloth / Fiberfill Breast Forms

These are often used in mastectomy products and are made of soft fiberfill covered in fabric. They’re very lightweight and don’t create much shape, but can still be worn for modesty or layering.

Best for: Sleepwear, layering under loose clothing

What to know: Not ideal for shaping or realism, but incredibly comfortable and low-maintenance.

DIY / Rice Bags / Sock Stuffing

DIY options like rice bags or stuffing socks are common early steps for many of us. They’re super affordable, easy to customize, and let you play with size before buying forms.

Best for: Budget-friendly experimentation, first-time wearers

What to know: These aren’t secure, can shift around, and won’t give a super realistic shape—but they’re validating and fun to try.

How to Choose Breast Forms: Sizing

Breast form sizing is different from bra sizing, and it varies by brand. Most forms come in numbered sizes (like 4–12), and your band size helps determine what form size will fit.

A general rule: the larger your band size, the larger the form you’ll need to fill the cup proportionally.

Some sizing guides:

• Band size 32–34: Form size 4–6
• Band size 36–38: Form size 6–8
• Band size 40–42: Form size 8–10

But form shape also matters—a teardrop will cover more area than a triangle in the same size.

If you’re using a pocket bra, always check its sizing chart against your form.

How to Choose Breast Forms: Matching to Bras

Finding the right bra makes a huge difference in how your breast forms feel and look.

• Pocket bras are made specifically for breast forms. They keep things in place and feel secure.
• T-shirt bras and molded cups can cradle foam forms well, especially for daily wear.
• Full-coverage bras are great for larger forms and for holding everything in place.
• Avoid plunge, push-up, or low-cut bras unless you’re taping or securing your forms tightly. They can shift or peek out.

If your bra doesn’t have a pocket, go for snug and stretchy. The firmer the fit, the less movement.

How to Choose Breast Forms: What to Consider Before Buying

• Realism vs comfort – Do you want something that feels real or just something soft and light?
• Heat and sweat – Silicone can be heavy in summer. Foam may feel better for warmer climates.
• Budget – DIY, foam, and secondhand forms are great places to start.
• Visibility – Will you wear these under clothes or just at home?
• Weight – Consider how long you’ll be wearing them. Heavy forms can get tiring.
• Movement – If you plan to move around a lot, you’ll want forms that stay put.

How to Choose Breast Forms: My Personal Experience

I started out with a rice bag. I just wanted to see what it felt like to fill out a bra. It was validating and fun to play with, but it didn’t really give me the shape I wanted.

Eventually, I bought a pair of teardrop silicone forms. They gave me the look I was going for—more roundness, weight, and that nice curve under a shirt. That’s pretty much all I’ve used so far. But I definitely want to try foam forms, especially with how hot it gets where I live. I’m curious how different they feel day-to-day.

This is one of those things I plan to experiment with more as I go.

How to Choose Breast Forms: Quick Match Guide

Situation	Recommended Type
Everyday realism	Silicone
Beginner or budget	Foam or DIY
All-day wear	Foam or silicone
Sleepwear / relaxing	Cloth or foam
Fantasy / kink	Larger silicone

How to Choose Breast Forms: Final Thoughts

Choosing breast forms doesn’t have to be intimidating. Start with where you are, what you need, and what makes you feel a little more like you. You don’t need the fanciest pair. You don’t even need to get it right the first time.

Try things. Explore. Adjust. You’ll figure out what works.

And when you do? Baby, it’s magic.