Style

Five bra shapes, and what each is for

13 November 2026

T-shirt, balconette, plunge, full cup, bralette. The names describe how a bra is cut, and the cut decides which clothes it works under and which bodies it suits.

Shape before size

Most advice about bras is about size, and size is only half of fit. Two bras in the same size from the same maker can sit quite differently, because one is cut low and wide and the other high and close. A woman who has been measured correctly and still finds that half her bras annoy her has usually met a problem of shape.

The names on a product page are the key to it. T-shirt, balconette, plunge, full cup and bralette each describe how the cups are cut, where the straps are set and how much of the breast is covered. Once you know what the words mean, a page of near-identical black bras sorts itself into five different garments.

The T-shirt bra

A T-shirt bra has smooth moulded cups with no seams across them, so that nothing shows through a fine knit. It is the bra most women wear most days, and the one shops sell in the greatest numbers.

Its strength is also its limit. A moulded cup has a shape of its own and keeps it whether or not you fill it. If your shape matches the mould, the fit is clean. If it does not, the cup gapes at the top or stands away at the side, and changing size will not cure it. When a T-shirt bra never quite fits in any size, try the same size in a different maker’s mould, or a different cut altogether.

Balconette and plunge

These two are cut for necklines. A balconette has cups cut straight across and fairly low, with the straps set wide, towards the shoulders. It lifts from below and leaves the upper part of the breast uncovered, which suits square and wide necklines. The wide straps can slip on narrow or sloping shoulders, and that is the usual reason a balconette is sent back.

A plunge is cut the other way. The cups angle towards the centre and the piece of fabric that joins them sits low, so that the bra disappears under a V-neck or a wrap dress. Because there is less fabric at the centre it contains less, and women with fuller busts sometimes find that a plunge needs a firmer band than their other bras to stay put.

Full cup, and cups with seams

A full-cup bra covers the whole breast and carries the straps more or less straight up from the centre of each cup. It offers the most support and containment of the five, and it is the cut most makers continue into their largest sizes.

Many full-cup bras are seamed, which is to say the cup is sewn together from two, three or four pieces of fabric. Seams have a poor reputation because they can show through thin tops. They are also the reason these bras fit so well. A cup built from several pieces can be shaped far more precisely than one pressed in a mould, and it adjusts to the wearer where a mould will not. If support is what you want from a bra, a seamed cup deserves a second look.

Close view of a black bra strap passing through a metal ring and slider, beside the edge of a smooth cup. — Straps adjust the fit by a centimetre or two. The band and the cut of the cup do the rest.

The bralette

A bralette has no wire and little structure: two soft triangles or a band of lace or jersey, often sold in sizes from small to large instead of by band and cup. It is the most comfortable of the five and the least supportive, and nobody buys one in the belief that it will do the work of a wired bra.

Read the size chart with care, because a letter size has to cover several band and cup combinations at once, and it covers some better than others. Makers who offer bralettes in fuller-bust ranges usually say so, and widen the band and straps to match.

Which to own

Start from your clothes. If you live in fine knits and T-shirts, the smooth cup earns its place. If your necklines are wide or low, one balconette or plunge saves a good deal of adjusting. For long days, or a fuller bust, a seamed full cup is often the bra that is still comfortable at six in the evening. A bralette is for the hours when comfort is the whole point.

Whatever the mix, bras last longer when they are worn in turn, since elastic recovers when it is rested. Our essay on measuring covers size, and the shop’s returns terms cover the rest. Read them before ordering one style in two sizes, since some shops do not take underwear back.

In the shops