For a wedding guest, choose a floor-length dress when the invitation, setting or time of day calls for ceremony. Choose separates when you want more control over coverage, movement and repeat wear. Andres Otalora's gowns run from $574 to $1,870, so the decision is less about finding one correct price and more about deciding how much presence the occasion needs. A maxi such as the Costera strapless tie-detail floral-print linen maxi dress has a softer, more relaxed direction, while the Puente de Sol pleated crinkled silk-chiffon maxi dress reads as a full evening look.

The middle ground is useful. The Tu Esencia embroidered tiered linen maxi dress and Kalahari printed cotton-poplin maxi dress have length without the severity of a formal column. If the wedding is outdoors, look at the hem and neckline before falling for the print. You need enough room to walk on grass, sit through dinner and move without holding the skirt up.

Start with the part that cannot be fixed easily. A strapless or halterneck dress needs to feel secure around the ribs before you assess the skirt, and a cutout needs to stay in place when you twist and sit. Raise both arms, take a full step and sit down in the fitting room. If the neckline shifts or the waist cuts in when seated, the problem will become more obvious over a long ceremony.

The cotton and linen pieces here run from $740 to $910. Their appeal is the combination of a lighter visual line and enough detail to feel special, but linen can crease where the body bends. Pack it on a broad hanger or roll it loosely, then steam rather than pressing every fold flat. Check the length with the shoes you will actually wear. A midi such as the Florecer strapless appliquéd linen midi dress needs a different heel decision from a mini such as the Amarula Porfavor printed linen mini dress.

For sizing, buy for the shoulder, bust and waist first. A tailor can shorten a plain hem more easily than they can reposition a cutout, alter a beaded edge or rebuild a tiered skirt.

Separates work for a wedding when the pieces share one clear idea. Keep the proportions intentional: a fitted or compact top with volume below, or a longer line on top with a clean skirt. Do not add a second dramatic detail simply because the pieces were bought apart. If the print is doing the work, let the jewellery and shoes stay quiet. If the silhouette is plain, one embellished accessory gives the outfit a reason to be remembered.

A long dress needs practical planning too. The Un Martini floral-print chiffon maxi dress and Estetica Pura ruffled tiered floral-print satin maxi dress bring movement, so a small hand-held bag is less distracting than a shoulder strap crossing the bodice. The Un Ritmo bead-embellished plissé-linen maxi dress already has texture and shine, which makes a simple shoe the more useful companion.

For a daytime ceremony, a mini or midi can take a flat or low heel and a light layer. For evening, the same attention to proportion works with a longer hem and a more polished shoe. Keep a wrap or jacket in mind, but make sure it does not catch on embellishment or flatten a ruffle.

We would buy for the wedding we actually have, not for an imaginary calendar of grand occasions. The Costera is the sensible starting point if the setting is relaxed, while the Puente de Sol is the choice when the invitation truly asks for a gown. We would inspect every strapless and cutout area in motion, then check the hem with the final shoes. The cotton and linen group is easier to wear in daylight, but creasing and alteration still need planning. We would skip a mini if the ceremony is formal and skip a heavily tiered skirt if we will spend the day travelling.

If you take one thing away: decide the venue and shoes first, then choose the dress or separates that let you move.