A-line
Closely fitted through the bust and the waist, then breaking away into a defined A. The shape is a particular one and it has to be cut precisely: the bodice sits tight to the body so the skirt reads as a clean triangle from the waist down, not as a gentle widening.
Done properly it is the shape most brides end up choosing, and it is the easiest to walk, sit and dance in, which matters more by the end of the night than most brides expect.
Ball gown
A fitted bodice with a full, rounded skirt built up from multiple layers. Where an A-line goes out in a straight line, a ball gown curves — the volume stands away from the body and carries the whole way round. It is the most over-the-top of the silhouettes and the most retro, and it reads unmistakably as a wedding dress.
Worth knowing practically: a full skirt needs room. In a small venue with tight tables it can be genuinely difficult to move, and a bustle becomes essential rather than optional.
Column and sheath
A straight skirt that falls rather than one that is shaped around you. The silhouette is described by the skirt, not by where it begins — the break can sit under the bust, at the waist or on the hips and it is still a column. What makes it one is that the skirt is bias cut or draped and hangs straight down.
That is the point people most often get wrong: a column does not cling to the body, it falls away from it. Perdita is a good example — a boned corset above a skirt that simply drops — and so is Beatrice, with the interest moved to the back.
Fit-and-flare
Fitted through the bodice and held in around the hips, then released out towards the knee. Where the shape changes is what separates it from the others: an A-line goes out at the waist, a column never goes out at all, and a fit-and-flare stays in over the hip and opens up low.
Two-piece and separates
A separate bodice and skirt rather than one gown. The practical advantage is real: the two pieces can be fitted independently, which suits any bride whose waist and hip measurements sit at different points on a size chart — which is most brides.
It also gives you options on the day. Portia pairs a sheer flowing skirt with a structured corset, and Miranda takes the idea further with a cape that lifts away for the reception.
Choosing between them
Try the one you think you want, then deliberately try the one you think you do not. Brides change their minds about silhouette more often than about any other single element, and almost always after seeing it on rather than in a photograph.
Then think about the day itself — the venue, the flooring, whether you are outside, how long you will be standing. A gown that photographs beautifully and cannot be walked in is a bad trade.
If your answer sits between two shapes, that is a good reason to have one made for you rather than compromising on one that nearly works.