Short answer
Bridesmaid dresses can run small, but it varies by brand and style. Sizing charts differ, so always measure each bridesmaid and compare with the specific brand's size guide. Do not rely on your usual high street size.
Many bridesmaid dress brands use their own sizing, which can be smaller than standard UK high street sizes. Some styles are cut close to the body, while others are more generous. The safest approach is to measure each bridesmaid at the bust, waist and hips, then check those measurements against the brand's size chart.
If a bridesmaid falls between sizes, most brands suggest sizing up, because taking a dress in is easier than letting it out. Remember that different fabrics also behave differently. Stretchy jersey dresses are more forgiving, while structured satin or taffeta has less give.
Ask each bridesmaid to try on a sample if possible, or order a swatch and a toile. Many online retailers offer sample dresses to try at home. If you are buying from a physical shop, the staff can help you measure correctly. Never guess sizes based on age or height. Each person's shape is unique, and a well fitting dress makes everyone feel wonderful.
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