Common styles of bridesmaid gowns include A-line, mermaid, ball gown, and sheath. A-line dresses are fitted at the waist and flare out to the hem, while mermaid dresses are fitted through the hips and thighs and flare out at the bottom. Ball gown dresses have a full skirt and a fitted bodice, while sheath dresses are slim-fitting and straight from top to bottom.