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The Ivory Edit

Prom and Formal Dresses: Sizing and Fit Guide

How to choose a prom or formal dress: measurements, size charts, fit, hemline and when an alteration is worth it.

A young woman in a dusty-blue formal gown standing by a window at dusk

Prom and formal dresses are sized differently from one brand to the next, and the fit is often more important than the colour or the detail. This section explains how to measure, how to read a size chart, and how to decide whether a dress can be made to fit.

Measure, then read the chart

Start with the sizing guide. It covers bust, waist and hip measurements, how to take them, and how to match them to a brand's chart rather than the label. The size estimator in the guide gives a starting point you can check against the chart.

Read the prom and formal sizing guide

Choose the silhouette for the event

Formal events vary. A dinner dance suits a fitted or A-line silhouette, a garden party suits a softer fabric, and a formal ball often suits a fuller skirt. The silhouette guide covers each shape, with notes on movement and comfort.

Read the silhouette guide

Check the fabric and the care

Stretch and structured fabrics fit differently, and some need more care than others. The fabric guide explains satin, crepe, tulle, chiffon, organza and lace, with notes on what to expect on the night.

Read the fabric guide

Plan the fittings

Allow time for a fitting before the event, especially if the hem or the waist needs changes. The alteration guide explains typical costs and how far ahead to book.

Read the alteration guide