Skirts for a formal do
Pick skirts in flowy fabrics like georgettes, crepes and soft silk.
You could also wear layers, panels or skirts that are fitted at the hips and flare out at the hem.
Embroidered hems or waist belts are also ideal for a formal do. Look for lace trimmings as the feminine look is very in.
As for length, a little below the knee or calf length looks good. For a dressy look, opt for floor length skirts, which are fitted at the hips.