T-Shirt Bra Size Guide & Calculator — Find Your Perfect Fit
T-shirt bras need specific features for a smooth, invisible look under fitted tops. Use our guide to find your ideal size and the best styles.
What Makes a Great T-Shirt Bra
A great T-shirt bra is seamless, full-coverage, and moulded to create a smooth silhouette under clingy fabrics. Your T-shirt bra size is typically the same as your regular bra size, but the cup style matters just as much — opt for full coverage with smooth, seamless edges.
Best T-Shirt Bra Types
Seamless
No visible lines under clothes. Perfect for thin, clingy fabrics and body-hugging tops.
Full Coverage
Encapsulates the entire breast for a smooth, rounded silhouette with no spillage.
Moulded Cup
Pre-shaped cups maintain their form under clothing and provide a consistently smooth look.
Lightly Lined
Thin foam lining adds modesty and subtle shaping without bulky padding under tees.
Tips for the Perfect T-Shirt Bra Fit
- Choose seamless, full-coverage styles — visible lines, lace texture, or cup edges will show through fitted tees. Moulded cups provide the smoothest look.
- Match the bra color to your skin tone, not your T-shirt color. A nude-for-you bra disappears under white and light-colored tops better than a white bra.
- Ensure the cup edges lie completely flat against your skin. Any gaping at the top will create visible ridges under tight T-shirts. Use the scoop-and-swoop method.
Frequently Asked Questions
What is a T-shirt bra?
A T-shirt bra is designed to be invisible under fitted tops. It features seamless, smooth cups (usually moulded or foam-lined), full coverage, and no lace or embellishments that would show through clothing. The name comes from its ability to disappear under a basic T-shirt.
Should I buy a different size for a T-shirt bra?
Generally, no — your T-shirt bra size should be the same as your regular bra size. However, because T-shirt bras are often full-coverage moulded cups, they can be less forgiving of size mismatches. If your regular size gaps in a T-shirt bra, try one cup size smaller or a demi T-shirt bra.
Which brands make the best T-shirt bras?
Top brands for T-shirt bras include ThirdLove (24/7 Classic T-Shirt Bra), Natori (Feathers), Wacoal (Basic Beauty), and Calvin Klein (Perfectly Fit). For budget options, try Aerie (Real Sunnie) or Uniqlo (Beauty Light). Look for seamless, moulded cups with smooth edges.