A UK 28G bra size means your underbust is around 23–24 inches (58–61 cm) and your full bust is approximately 34–35 inches (86–89 cm). That’s a 10‑inch difference — a significantly projected shape on the narrowest standard band. A 28G is still a relatively small overall volume (akin to a 34E or 32F), but it absolutely requires deep, structured cups and a band that doesn’t budge. The right 28G bra lifts from a firm base, centers the tissue, and ends the cycle of slipping straps and aching shoulders.
28G at a Glance
| Attribute | Detail |
|---|---|
| Band Size | 28 inches (underbust 23–24″ / 58–61 cm) |
| Full Bust Measurement | 34–35 inches (86–89 cm) |
| Cup Difference | ~10 inches (~25.4 cm) — UK G cup |
| Sister Sizes (UK) | 26GG (tighter band) · 30FF (looser band) |
| Likely US Equivalent | 28I (check brand chart) |
| EU Size | 60I |
| AU / NZ Size | 6G |
| S/M/L Equivalent | Petite‑sized support |
| Cup Volume Equivalent | Similar to 26GG and 30FF |
What Is a 28G Bra Size?
28G is a UK size that sits firmly in the “small band, projected cup” category. The underbust is a very narrow 23–24 inches, and the bust projects 10 inches forward. This is a legitimately curvy figure on a petite frame, but the overall breast volume is still compact compared to larger band sizes. The G cup is not a static volume — it’s relative to the band, and on a 28 band, it’s simply the depth needed to contain tissue that measures 10 inches more than the ribcage.
The 28 band must be rigid and grippy. At G cup depth, the bust weight is enough that a loose band will immediately ride up, causing the straps to take over and dig painfully into your shoulders. A correct 28 band will feel snug on the loosest hook and stay horizontal all day. If you’ve been wearing a 30FF or 32F, you’ve likely experienced constant slipping and adjustment. Moving to a 28G transfers the load back onto your torso, where it belongs.
The G cup demands depth and forward projection. The cups must have a deep lower panel that allows the breast to sit naturally without pushing the wire down. Seamed cups — particularly balconettes and side‑support styles — are engineered to do this. They use multiple fabric panels to create a 3D bowl shape that foam cups simply can’t replicate. A shallow moulded bra will flatten the tissue, cause wrinkling at the bottom, and push the breast toward the armpits. At 28G, seams are your best friend.
Many people wearing 30FF, 32F, or even 34DD are actually 28G. The change can feel dramatic — the band will feel tighter than anything you’ve worn before, and the cups may initially seem large. But once you scoop your tissue into the cups and the band settles, you’ll realize this is how a bra is supposed to feel: supported, lifted, and completely forgettable.
28G Bra Measurements
Take these measurements on bare skin with a soft tape measure. Breathe normally, and don’t pull the bust tape too tight — it should just touch the skin without compressing the tissue.
10‑inch difference = UK G cup
Wrap the tape around your ribcage directly below your breasts. Pull it to the tension you’d expect a supportive band to have — firm but not painful. For 28G, the number is almost always 23–24 inches. If you measure 25 inches or above, start with a 30 band.
Place the tape over the fullest part of your breasts, usually at nipple level. Keep it parallel to the floor and don’t compress. For 28G, the measurement is usually 34–35 inches. If one breast is larger, use the larger side.
Subtract the underbust from the full bust. Every inch equals one cup letter in the UK system. 10 inches = G. If you have 9 inches, you’re a 28FF; 11 inches indicates a 28GG.
Put the bra on the loosest hooks. Lean forward and scoop all tissue from the sides into the cups. The band must be level and immobile; you should be able to insert no more than one finger comfortably underneath. The gore must sit flat against your sternum. The cups should be completely filled — no wrinkles, no spillage. If the band rides up, try 26GG; if the cups overflow, try 28GG.
What Does 28G Look Like?
A 28G bust is noticeably projected and full, but on a very small frame it remains proportionate. The breasts sit high on the chest wall and create a defined, rounded silhouette. From the side, the 10‑inch projection is clear, but from the front, the bust doesn’t overpower the torso. Many 28G wearers describe their shape as “curvy petite” or “small back, full bust.” In a well‑fitted bra, the tissue is lifted and centered, giving a balanced hourglass appearance without bulk.
Seamed Balconette Bra — Deep Cup & Firm Band for 28G
- Multi‑part cup with a reinforced lower panel for immediate projection
- Side sling brings tissue forward for a narrow, lifted silhouette
- High‑grade 28 band stays anchored all day
- Available in a wide range of colors and fabrics from UK brands
Side‑Support Full Cup Bra — Maximum Anchorage & Center
- Strong side panels contain tissue and prevent east‑west spread
- Deep lower cup lifts from the base without folding
- Stretch lace top adapts to fluctuations and asymmetry
- Ideal for soft tissue or long‑wear comfort
Narrow Torso, Curvy Bust
28G on a very slim frame creates a striking but natural hourglass. The band must be exceptionally tight to handle the projection.
Very firm bandV‑Shaped Upper Body
Even with a sporty build, the small ribcage demands a 28 band. A leotard back or J‑hook keeps the straps in place.
Convertible strapsLower Fullness
Tissue concentrated below needs a cup with deep immediate projection. A seamed balconette or side‑support bra is non‑negotiable.
Deep lower cupRound & Firm
Can wear a wider variety of styles, including half‑cups and certain foam bras, as long as the depth at the wire is adequate.
Check lower cup depthIs 28G Considered Big?
It is a full‑looking size on a tiny band, but the absolute volume is still moderate. A 28G is the same cup volume as a 30FF, 32F, or 34E. Society tends to label anything above a D cup as “big,” but that’s because most people are wearing bands that are too large and cups that are too small. Someone correctly fitted into a 28G typically looks lifted, compact, and beautifully proportioned — not heavy or busty. If you feel huge in a 28G, it’s because the bra isn’t fitting correctly, not because the size is inherently enormous.
28G is a naturally curvy shape on a small frame. It’s not extreme or abnormal. The right bra will give you a rounded, forward‑facing profile that feels weightless because the band does the work.
If the cup feels too full, try a 28GG. If the band feels unbearably tight, first ensure the cup isn’t too small (a too‑small cup will make the band feel tight). Then try a 30FF sister size.
28G Sister Sizes
Sister sizes allow you to keep the cup volume the same while moving up or down in band size. For 28G, the tighter sister is 26GG (down a band, up a cup), and the looser sister is 30FF (up a band, down a cup). Keep in mind that wire width and cup shape can change across sister sizes — a 30FF may have slightly wider wires than a 28G in the same style.
Rule: Up one band → Down one cup (28G → 30FF) | Rule: Down one band → Up one cup (28G → 26GG) | Result: Cup volume remains very similar.
| Smaller Band | Reference Size | Larger Band |
|---|---|---|
| 26GG | 28G — You | 30FF |
| 24H | 28G | 32F |
28G vs Other Sizes
These comparisons target the most common sizing dilemmas for the 28G bracket.
- One cup larger than 28FF
- 10″ difference vs 9″
- Better if 28FF causes quad boob or floating gore
- Same band, slightly less depth
- Good if 28G cups wrinkle at the top or feel too roomy
- One cup smaller than 28GG
- 10″ difference
- Correct if cups are smoothly filled
- Same band, more depth (11″ difference)
- Try if 28G spills over or wires press on tissue
- Firmer, more supportive band
- Designed for a true 23–24″ underbust
- Provides maximum lift and stability
- Sister size — same cup volume
- Looser band; best if 28G band is unbearably tight even with correct cup size
- Standard 28 band
- Starting point for most
- Tighter sister size
- Same cup volume
- Use only if 28 band continually rides up or feels loose
Best Bra Styles for 28G
At 28G, you’re in prime UK full‑bust territory. Brands like Panache, Freya, Cleo, and Curvy Kate design bras specifically for this projection‑to‑band ratio. Seamed balconettes, side‑support full cups, and stretch‑lace plunges will be your staples. Moulded cups can work if they’re designed with depth at the wire (e.g., Panache Cari, Freya Deco), but be prepared to try them on; many will be too shallow.
Provides the depth, lift, and forward shape that 28G needs. Works for most shapes.
Side panels pull tissue front and center. Ideal for soft tissue or a preference for a rounded silhouette.
A deep plunge with stretch lace (like Panache Ana) can fit 28G beautifully if the band is firm.
Panache Sport or Freya Active in 28G will lock you down. No generic compression bras.
A single‑layer rigid foam cup cannot support 10 inches of projection. Avoid unless the bra is specifically marketed as projected.
Wireless bras for 28G exist but rarely provide enough lift and separation for all‑day wear. Reserve for sleeping or lounging.
Common Fit Problems with 28G
The band is too large for your underbust. A 30 or 32 band cannot anchor a G cup properly.
The cup is too small or too closed on top. Your 10‑inch projection may need an 11‑inch cup.
The cup lacks immediate projection at the underwire. The breast pushes the bra down out of the inframammary fold.
The wires are either too narrow or the cup is too small. Side breast tissue is escaping.
International Size Conversion for 28G
UK 28G is a specific size. In the US, it’s usually labeled 28I (sometimes 28H or 28J, depending on the brand’s alphabet). European size is 60I. Australian is 6G. To avoid confusion, always count the number of cup sizes above D: UK 28G is 5 cups above D (D‑DD‑E‑F‑FF‑G). Match that count in the target brand’s size chart.
For international purchases, rely on the Global Bra Size Converter to cross‑check before ordering.
Frequently Asked Questions
Generally a US 28I, but you must verify with the specific brand’s size chart because US cup progression is inconsistent.
Underbust about 23–24 inches, full bust about 34–35 inches — a 10‑inch difference.
The absolute volume is moderate (same as a 34E). It’s the band size that makes the letter G; the bust itself is not huge.
UK sister sizes are 26GG (tighter) and 30FF (looser). They have the same cup volume on different bands.
Choose 28G if 28FF cups overflow, the center gore floats, or the wires dig into tissue. Choose 28FF if 28G cups gap or wrinkle.
Online at Brastop, Bare Necessities, Figleaves, Amazon, and from UK brands like Panache, Freya, Cleo, and Curvy Kate. Search for “28G bra”.
Lock In Your Ideal 28G Size
Measure precisely to find out if 28G, 26GG, 30FF, or a nearby size gives you the best comfort, lift, and shape.
