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The Black Heart Fit Guide
Find your fit using the measurements below.
Bras available in sizes 32B-36DD. Panties and garter belts available in XS-L.
How to measure
Use a soft tape measure and measure directly against the body.
Bras (Longline and Push-Up): Measure snugly around your ribcage, directly beneath your bust, for your band size. Then measure around the fullest part of your bust. The difference between the two measurements determines your cup size. A 2-inch difference corresponds to a B cup, 3 inches to a C cup, 4 inches to a D cup, and 5 inches to a DD cup.
Triangle Bra: Use the same two measurements, underbust and full bust, and match them to the size chart below.
Panties and Garter Belt: Measure the narrowest part of your waist and the fullest part of your hips. If your measurements fall into different sizes, use your hip measurement as the guide.
Between sizes
Silk is designed to contour comfortably to the body. If your measurements fall between sizes, we generally recommend choosing the larger size.
Bras · Longline
Our Silk Longline Bra combines extended support with a contoured silhouette and slightly more flexibility through the band than our Push-Up Bra.
From Brennah, on fit.
“My underbust is 28 inches, my bust is 33 inches, and I wear a 32DD in our Silk Longline Bra. I designed this bra with extended support and a contoured silhouette, creating a fit that feels supportive, flattering, and comfortable throughout the size range.”
Band
| Underbust | BHL Band |
|---|---|
| 27-29" | 32 |
| 30-31" | 34 |
| 32-33" | 36 |
Cup
| Difference | Cup |
|---|---|
| 2" | B |
| 3" | C |
| 4" | D |
| 5" | DD |
Supportive, sculpted fit with light flexibility through the band. For a firmer fit, choose your recommended size. For a relaxed fit, size up in the band. Crafted from silk with a touch of stretch for comfort and ease of movement.
Bras · Push-Up
This is a soft-cup push-up without molded padding, creating shape through the cut, support, and construction of the bra rather than a pre-formed cup.
From Brennah, on fit.
“My underbust is 28 inches, my bust is 33 inches, and I wear a 32DD in our Silk Push-Up Bra. I designed this soft-cup push-up to create lift and shape without molded padding, for a more natural silhouette.”
Band
| Underbust | BHL Band |
|---|---|
| 27-29" | 32 |
| 30-31" | 34 |
| 32-33" | 36 |
Cup
| Difference | Cup |
|---|---|
| 2" | B |
| 3" | C |
| 4" | D |
| 5" | DD |
Lifted, supportive fit with an open-back silhouette. Because the back is more minimal, choose the size that gives you a secure band fit. The cup is soft, not molded. If you are between band sizes, size up for a smoother, more comfortable fit. Crafted from silk with a touch of stretch for comfort and ease of movement.
Triangle Bra
Choose your size using your underbust and full-bust measurements. Adjustable straps allow for a more personalized fit.
From Brennah, on fit.
“I’m a 32DD, and wear a Medium in our Silk Triangle Bra. It's the piece I reach for when I want something softer, lighter, and more effortless.”
| BHL Size | Underbust (in / cm) | Full Bust (in / cm) | US (bra equiv) | EU |
|---|---|---|---|---|
| XS | 26-28" / 66-71 | 28-31" / 71-79 | 30A-32B | 65A-70B |
| S | 28.5-30" / 72-76 | 31.5-34" / 80-86 | 32B-34C | 70B-75C |
| M | 30.5-33" / 77-84 | 34.5-37" / 88-94 | 34C-36D | 75C-80D |
| L | 33.5-36" / 85-91 | 37.5-40" / 95-102 | 36D+ / measurement-led | 80D-85E |
For Triangle sizing, use the underbust and full-bust measurements first. Bra-size equivalents are only a secondary guide.
XS–L sizing. · Crafted from silk with a touch of stretch. · Adjustable fit with soft support.
Panties
From Brennah, on fit.
“My waist is 25 inches, and I wear a size Small in our Silk Panties. I designed them to feel soft against the body, with a fully silk-lined finish and adjustable details for a more customized fit.”
If your waist and hip measurements suggest different sizes, choose the size that corresponds to your hips.
| BHL Size | Waist (in / cm) | Hip (in / cm) | US | EU |
|---|---|---|---|---|
| XS | 23-24.5" / 58-62 | 33-35" / 84-89 | 0-2 | 32-34 |
| S | 25-27.5" / 64-70 | 35-37.5" / 89-95 | 4-6 | 36-38 |
| M | 28-30" / 71-76 | 38-40" / 97-102 | 8-10 | 40-42 |
| L | 30.5-32.5" / 77-83 | 40.5-43" / 103-109 | 12-14 | 44-46 |
XS–L sizing. · Fully silk-lined. · Adjustable details for a more personalized fit.
Garter Belt
From Brennah, on fit.
“My waist is 25 inches, and I wear a size Extra Small in our Garter Belt. I like it worn high on the waist, where it frames the body beautifully.”
Your waist measurement will determine your size.
| BHL Size | Waist (in / cm) | Hip (in / cm) | US | EU |
|---|---|---|---|---|
| XS | 23-25" / 58-64 | 33-35" / 84-89 | 0-2 | 32-34 |
| S | 25.5-27.5" / 65-70 | 35.5-37.5" / 90-95 | 4-6 | 36-38 |
| M | 28-30" / 71-76 | 38-40" / 97-102 | 8-10 | 40-42 |
| L | 30.5-32.5" / 77-83 | 40.5-43" / 103-109 | 12-14 | 44-46 |
Your Garter Belt size does not need to match your panty size. The suspenders are fully adjustable.
Designed to sit high on the waist and frame the silhouette.
Buying for her?
The Eclipse Silk Triangle Bra adjusts comfortably to the body and is available in XS-L. Panties and garter belts are available in XS-L.
You choose the gift. She chooses the fit.
Exchanges within 15 days.
Questions about fit?
Email Brennah directly at lovie@blackheartlingerie.us for personalized sizing guidance.
As the founder and designer of Black Heart, she can help you select the size that's right for you.
Exchanges within 15 days.
Indulge in Darkness, Embrace Your Light.
