Size 0: Bust 31.5", Waist 23", Hips 34.5"
Size 2: Bust 32.5", Waist 24", Hips 35.5"
Size 4: Bust 33.5", Waist 25", Hips 36.5"
Size 6: Bust 34.5", Waist 26", Hips 37.5"
Size 8: Bust 35.5", Waist 27", Hips 38.5"
Size 10: Bust 36.5", Waist 28", Hips 39.5"
Size 12: Bust 38", Waist 29.5", Hips 41"
Size 14: Bust 39.5", Waist 31", Hips 42.5"
Size 16: Bust 41", Waist 32.5", Hips 44"
Size 18: Bust 43", Waist 34.5", Hips 46"
Size 20: Bust 45", Waist 36.5", Hips 48"
Keep in mind that these measurements are just a guide, and it's always best to have your bridesmaids try on dresses in person or order a size up if they are in between sizes. It's also important to consider alterations, as most dresses will need to be hemmed or taken in to ensure a perfect fit.
697 × 750
Source:https://www.misshow.com/products/bm3002
2369 × 3847
Source:https://www.jennyyoo.com/page/fit-guide
1000 × 1754
Source:https://www.amazon.com/Rjer-Chiffon-Bridesmaid-Dresses-Evening/dp/B0CVVP39KL
683 × 759
Source:https://m.rissyroos.com/bari-jay-size-chart
693 × 486
Source:https://www.bridesmaids.com/allure1700.html
1566 × 1200
Source:https://www.angrila.com/products/a-line-scoop-neck-tea-length-satin-bridesmaid-dress-with-ruffle-split-front
537 × 850
Source:https://www.luulla.com/product/477466/woman-standard-size-chart-and-custom-size-chart-for-formal-evening-dress-prom-dress-party-dress-cocktail-dress-homecoming-dress-bridesmaid-dress-wedding-dress
682 × 851
Source:https://www.ballgownbridal.com/products/sheath-spaghetti-straps-ankle-length-light-blue-satin-bridesmaid-dress-ahc623
1695 × 1300
Source:https://prettygirldresses.com/product/tie-back-short-sleeve-bridesmaid-dress/
350 × 470
Source:https://www.amazon.com/cantcauli-Shoulder-Chiffon-Bridesmaid-Empire/dp/B0C9TGL4XJ